doc(): Adding the CONTRIBUTING document, based off angular.

CONTRIBUTING.md

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+# Contributing to angular-cli
+
+We would love for you to contribute to angular-cli and help make it even better
+than it is today! As a contributor, here are the guidelines we would like you
+to follow:
+
+ - [Code of Conduct](#coc)
+ - [Question or Problem?](#question)
+ - [Issues and Bugs](#issue)
+ - [Feature Requests](#feature)
+ - [Submission Guidelines](#submit)
+ - [Coding Rules](#rules)
+ - [Commit Message Guidelines](#commit)
+ - [Signing the CLA](#cla)
+
+## <a name="coc"></a> Code of Conduct
+Help us keep Angular open and inclusive. Please read and follow our [Code of Conduct][coc].
+
+## <a name="question"></a> Got a Question or Problem?
+
+If you have questions about how to *use* Angular CLI, please direct them to [StackOverflow][stackoverflow]. Please note that angular-cli is still in early developer preview, and the core team's capacity to answer usage questions is limited. We are also available on [Gitter][gitter].
+
+## <a name="issue"></a> Found an Issue?
+If you find a bug in the source code or a mistake in the documentation, you can help us by
+[submitting an issue](#submit-issue) to our [GitHub Repository][github]. Even better, you can
+[submit a Pull Request](#submit-pr) with a fix.
+
+## <a name="feature"></a> Want a Feature?
+You can *request* a new feature by [submitting an issue](#submit-issue) to our [GitHub
+Repository][github]. If you would like to *implement* a new feature, please submit an issue with
+a proposal for your work first, to be sure that we can use it. Angular CLI is in developer preview
+and we are not ready to accept major contributions ahead of the full release.
+Please consider what kind of change it is:
+
+* For a **Major Feature**, first open an issue and outline your proposal so that it can be
+discussed. This will also allow us to better coordinate our efforts, prevent duplication of work,
+and help you to craft the change so that it is successfully accepted into the project.
+* **Small Features** can be crafted and directly [submitted as a Pull Request](#submit-pr).
+
+## <a name="submit"></a> Submission Guidelines
+
+### <a name="submit-issue"></a> Submitting an Issue
+Before you submit an issue, search the archive, maybe your question was already answered.
+
+If your issue appears to be a bug, and hasn't been reported, open a new issue.
+Help us to maximize the effort we can spend fixing issues and adding new
+features, by not reporting duplicate issues.  Providing the following information will increase the
+chances of your issue being dealt with quickly:
+
+* **Overview of the Issue** - if an error is being thrown a non-minified stack trace helps
+* **Angular CLI Version** - what version of the CLI is affected (e.g. 0.1.2)
+* **Motivation for or Use Case** - explain what are you trying to do and why the current behavior is a bug for you
+* **Browsers and Operating System** - is this a problem with all browsers?
+* **Reproduce the Error** - provide a live example (using [Plunker][plunker],
+  [JSFiddle][jsfiddle] or [Runnable][runnable]) or a unambiguous set of steps
+* **Related Issues** - has a similar issue been reported before?
+* **Suggest a Fix** - if you can't fix the bug yourself, perhaps you can point to what might be
+  causing the problem (line of code or commit)
+
+You can file new issues by providing the above information [here](https://github.com/angular/angular-cli/issues/new).
+
+
+### <a name="submit-pr"></a> Submitting a Pull Request (PR)
+Before you submit your Pull Request (PR) consider the following guidelines:
+
+* Search [GitHub](https://github.com/angular/angular-cli/pulls) for an open or closed PR
+  that relates to your submission. You don't want to duplicate effort.
+* Please sign our [Contributor License Agreement (CLA)](#cla) before sending PRs.
+  We cannot accept code without this.
+* Make your changes in a new git branch:
+
+     ```shell
+     git checkout -b my-fix-branch master
+     ```
+
+* Create your patch, **including appropriate test cases**.
+* Follow our [Coding Rules](#rules).
+* Run the full Angular CLI test suite, as described in the [developer documentation][dev-doc],
+  and ensure that all tests pass (coming soon).
+* Commit your changes using a descriptive commit message that follows our
+  [commit message conventions](#commit). Adherence to these conventions
+  is necessary because release notes are automatically generated from these messages.
+
+     ```shell
+     git commit -a
+     ```
+  Note: the optional commit `-a` command line option will automatically "add" and "rm" edited files.
+
+* Push your branch to GitHub:
+
+    ```shell
+    git push origin my-fix-branch
+    ```
+
+* In GitHub, send a pull request to `angular-cli:master`.
+* If we suggest changes then:
+  * Make the required updates.
+  * Re-run the Angular CLI test suites for JS and Dart to ensure tests are still passing.
+  * Rebase your branch and force push to your GitHub repository (this will update your Pull Request):
+
+    ```shell
+    git rebase master -i
+    git push -f
+    ```
+
+That's it! Thank you for your contribution!
+
+#### After your pull request is merged
+
+After your pull request is merged, you can safely delete your branch and pull the changes
+from the main (upstream) repository:
+
+* Delete the remote branch on GitHub either through the GitHub web UI or your local shell as follows:
+
+    ```shell
+    git push origin --delete my-fix-branch
+    ```
+
+* Check out the master branch:
+
+    ```shell
+    git checkout master -f
+    ```
+
+* Delete the local branch:
+
+    ```shell
+    git branch -D my-fix-branch
+    ```
+
+* Update your master with the latest upstream version:
+
+    ```shell
+    git pull --ff upstream master
+    ```
+
+## <a name="rules"></a> Coding Rules
+To ensure consistency throughout the source code, keep these rules in mind as you are working:
+
+* All features or bug fixes **must be tested** by one or more specs (unit-tests).
+* All public API methods **must be documented**. (Details TBC).
+* We follow [Google's JavaScript Style Guide][js-style-guide], but wrap all code at
+  **100 characters**. An automated formatter is available, see
+  [DEVELOPER.md](DEVELOPER.md#clang-format).
+
+## <a name="commit"></a> Commit Message Guidelines
+
+We have very precise rules over how our git commit messages can be formatted.  This leads to **more
+readable messages** that are easy to follow when looking through the **project history**.  But also,
+we use the git commit messages to **generate the Angular CLI change log**.
+
+### Commit Message Format
+Each commit message consists of a **header**, a **body** and a **footer**.  The header has a special
+format that includes a **type**, a **scope** and a **subject**:
+
+```
+<type>(<scope>): <subject>
+<BLANK LINE>
+<body>
+<BLANK LINE>
+<footer>
+```
+
+The **header** is mandatory and the **scope** of the header is optional.
+
+Any line of the commit message cannot be longer 100 characters! This allows the message to be easier
+to read on GitHub as well as in various git tools.
+
+### Revert
+If the commit reverts a previous commit, it should begin with `revert: `, followed by the header of the reverted commit. In the body it should say: `This reverts commit <hash>.`, where the hash is the SHA of the commit being reverted.
+
+### Type
+Must be one of the following:
+
+* **feat**: A new feature
+* **fix**: A bug fix
+* **docs**: Documentation only changes
+* **style**: Changes that do not affect the meaning of the code (white-space, formatting, missing
+  semi-colons, etc)
+* **refactor**: A code change that neither fixes a bug nor adds a feature
+* **perf**: A code change that improves performance
+* **test**: Adding missing tests or correcting existing tests
+* **build** Changes that affect the build system, CI configuration or external dependencies (example scopes: gulp, broccoli, npm)
+* **chore**: Other changes that don't modify `src` or `test` files
+
+### Scope
+The scope could be anything specifying place of the commit change. For example
+`Compiler`, `ElementInjector`, etc.
+
+### Subject
+The subject contains succinct description of the change:
+
+* use the imperative, present tense: "change" not "changed" nor "changes"
+* don't capitalize first letter
+* no dot (.) at the end
+
+### Body
+Just as in the **subject**, use the imperative, present tense: "change" not "changed" nor "changes".
+The body should include the motivation for the change and contrast this with previous behavior.
+
+### Footer
+The footer should contain any information about **Breaking Changes** and is also the place to
+reference GitHub issues that this commit **Closes**.
+
+**Breaking Changes** should start with the word `BREAKING CHANGE:` with a space or two newlines. The rest of the commit message is then used for this.
+
+A detailed explanation can be found in this [document][commit-message-format].
+
+## <a name="cla"></a> Signing the CLA
+
+Please sign our Contributor License Agreement (CLA) before sending pull requests. For any code
+changes to be accepted, the CLA must be signed. It's a quick process, we promise!
+
+* For individuals we have a [simple click-through form][individual-cla].
+* For corporations we'll need you to
+  [print, sign and one of scan+email, fax or mail the form][corporate-cla].
+
+
+[coc]: https://github.com/angular/code-of-conduct/blob/master/CODE_OF_CONDUCT.md
+[commit-message-format]: https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#
+[corporate-cla]: http://code.google.com/legal/corporate-cla-v1.0.html
+[dev-doc]: https://github.com/angular/angular/blob/master/DEVELOPER.md
+[github]: https://github.com/angular/angular-cli
+[gitter]: https://gitter.im/angular/angular-cli
+[individual-cla]: http://code.google.com/legal/individual-cla-v1.0.html
+[js-style-guide]: http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml
+[jsfiddle]: http://jsfiddle.net/
+[plunker]: http://plnkr.co/edit
+[runnable]: http://runnable.com/
+[stackoverflow]: http://stackoverflow.com/questions/tagged/angular-cli