Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+## Process
+
+1. Submit an issue describing the changes you want to implement. (If it's only minor changes/bug-fixes, you can skip to step 3.)
+2. After the scope was discussed in the issue, assign it to yourself. (It should show up in the "In progress" column in the OpenBot project.)
+3. Fork the project and clone it locally.
+4. Create a branch and name it `<user_id>-<feature>` where `<feature>` concisely describes the scope of the work.
+5. Do the work, write good commit messages, push your branch to the forked repository.
+6. Create a [pull request](https://github.com/intel-isl/OpenBot/pulls) in GitHub and link the issue to it.
+7. Work on any code review feedback you may receive and push it to your fork. The pull request gets updated automatically.
+8. Get a cold drink of your choice to reward yourself for making the world a better place.
+
+## Guidelines
+
+- Use same style and formatting as rest of code. 
+  - For the Android code you can run:
+    1. `./gradlew checkStyle` --> returns java files with incorrect style. 
+    2. `./gradlew applyStyle` --> applies neccessary style changes to all java files.
+  - For the Arduino and Python code, just try to blend in.
+- Update documentation associated with code changes you made.
+- If you want to include 3rd party dependencies, please discuss this in the issue first. 
+- Pull requests should implement single features with as few changes as possible.
+- Make sure you don't include temporary or binary files (the gitignores should mostly take care of this).
+- Rebase/merge master into your branch before you submit the pull request.
+- If possible, test your code on Windows, Linux and OSX.
+
+
+If you are looking for more information about contributing to open-source projects, here are two good references:
+
+- [How to Contribute to Open Source](http://opensource.guide/how-to-contribute/)
+- [The beginner's guide to contributing to a GitHub project](https://akrabat.com/the-beginners-guide-to-contributing-to-a-github-project/)
+
+Thank you very much!