Add contributing guidelines

templates/CONTRIBUTING.md

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+## Contributing
+
+[fork]: https://github.com/ORG/REPO/fork
+[pr]: https://github.com/ORG/REPO/compare
+[style]: STYLEGUIDE
+[code-of-conduct]: CODE_OF_CONDUCT.md
+
+Hi there! We're thrilled that you'd like to contribute to this project. Your help is essential for keeping it great.
+
+Please note that this project is released with a [Contributor Code of Conduct][code-of-conduct]. By participating in this project you agree to abide by its terms.
+
+## Submitting a pull request
+
+0. [Fork][fork] and clone the repository
+0. Create a new branch: `git checkout -b my-branch-name`
+0. Make your change and remember to add tests
+0. Build the project locally and run local tests
+0. Push to your fork and [submit a pull request][pr]
+0. Pat your self on the back and wait for your pull request to be reviewed and merged.
+
+Here are a few things you can do that will increase the likelihood of your pull request being accepted:
+
+- Follow the [style guide][link to styleguide].
+- Write tests.
+- Keep your change as focused as possible. If there are multiple changes you would like to make that are not dependent upon each other, submit them as separate pull requests.
+- Write [good commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+
+## Resources
+
+- [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
+- [Using Pull Requests](https://help.github.com/articles/about-pull-requests/)
+- [GitHub Help](https://help.github.com)
+
+## Contributing Issues
+
+### Before Submitting an Issue
+First, please do a search in [open issues](https://github.com/Microsoft/azuredatastudio/issues) to see if the issue or feature request has already been filed. Use this [query](https://github.com/Microsoft/azuredatastudio/issues?q=is%3Aopen+is%3Aissue+label%3Afeature-request+sort%3Areactions-%2B1-desc) to search for the most popular feature requests.
+
+If you find your issue already exists, make relevant comments and add your [reaction](https://github.com/blog/2119-add-reactions-to-pull-requests-issues-and-comments). Use a reaction in place of a "+1" comment.
+
+:+1: - upvote
+
+:-1: - downvote
+
+If you cannot find an existing issue that describes your bug or feature, submit an issue using the guidelines below.
+
+## Writing Good Bug Reports and Feature Requests
+
+File a single issue per problem and feature request.
+
+* Do not enumerate multiple bugs or feature requests in the same issue.
+* Do not add your issue as a comment to an existing issue unless it's for the identical input. Many issues look similar, but have different causes.
+
+The more information you can provide, the more likely someone will be successful at reproducing the issue and finding a fix.
+
+The built-in tool for reporting an issue, which you can access by using `Report Issue` in Azure Data Studio's Help menu, can help streamline this process by automatically providing the version of Azure Data Studio, all your installed extensions, and your system info.
+
+Please include the following with each issue.
+
+* Version of Azure Data Studio (formerly SQL Operations Studio)
+
+* Your operating system
+
+> **Tip:** You can easily create an issue using `Report Issues` from Azure Data Studio Help menu.
+
+* Reproducible steps (1... 2... 3...) and what you expected versus what you actually saw.
+* Images, animations, or a link to a video.
+* A code snippet that demonstrates the issue or a link to a code repository we can easily pull down onto our machine to recreate the issue.
+
+> **Note:** Because we need to copy and paste the code snippet, including a code snippet as a media file (i.e. .gif) is not sufficient.
+
+* Errors in the Dev Tools Console (Help | Toggle Developer Tools)
+
+Please remember to do the following:
+
+* Search the issue repository to see if there exists a duplicate.
+* Simplify your scripts around the issue so we can better isolate the problem.
+
+Don't feel bad if we can't reproduce the issue and ask for more information!
+
+## Contributing Fixes
+If you are interested in fixing issues and contributing directly to the code base,
+please see the document [How to Contribute](https://github.com/Microsoft/azuredatastudio/wiki/How-to-Contribute).