Adding a CONTRIBUTING.md to repository

CONTRIBUTING.md

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+Lotus is an open source project and we would love you to help us make it better.
+
+## Reporting Issues
+
+A well formatted issue is appreciated, and goes a long way in helping us help you.
+
+* Make sure you have a [GitHub account](https://github.com/signup/free)
+* Submit a [Github issue](./issues) by:
+  * Clearly describing the issue
+    * Provide a descriptive summary
+    * Explain the expected behavior
+    * Explain the actual behavior
+    * Provide steps to reproduce the actual behavior
+    * Provide your application's complete `Gemfile.lock` as text (in a [Gist](https://gist.github.com) for bonus points)
+    * Any relevant stack traces
+
+If you provide code, make sure it is formatted with the triple backticks (\`).
+
+At this point, we'd love to tell you how long it will take for us to respond,
+but we just don't know.
+
+## Pull requests
+
+We accept pull requests to Lotus for:
+
+* Adding documentation
+* Fixing bugs
+* Adding new features
+
+Not all features proposed will be added but we are open to having a conversation
+about a feature you are championing.
+
+Here's a quick guide:
+
+1. Fork the repo.
+
+2. Run the tests. This is to make sure your starting point works. Tests can be
+run via `rake`
+
+3. Create a new branch and make your changes. This includes tests for features!
+
+4. Push to your fork and submit a pull request. For more information, see
+[Github's pull request help section](https://help.github.com/articles/using-pull-requests/).
+
+At this point you're waiting on us. Expect a conversation regarding your pull
+request; Questions, clarifications, and so on.
+
+Some things that will increase the chance that your pull request is accepted:
+
+* Use Lotus idioms
+* Include tests that fail without your code, and pass with it
+* Update the documentation, guides, etc.