Adding CONTRIBUTING.md and CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Facebook has adopted a Code of Conduct that we expect project participants to adhere to.
+Please read the [full text](https://code.fb.com/codeofconduct/)
+so that you can understand what actions will and will not be tolerated.

CONTRIBUTING.md

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+# Contributing to OpenCellular
+We want to make contributing to this project as easy and transparent as
+possible.
+
+## Pull Requests
+We actively welcome your pull requests.
+
+1. Fork the repo and create your branch from `master`.
+2. Make sure all commits are signed and verified. 
+3. If you've added code that should be tested, add tests.
+4. If you've changed APIs, update the documentation.
+5. Ensure the test suite passes.
+6. Make sure your code lints.
+
+## Issues
+We use GitHub issues to track public bugs. Please ensure your description is
+clear and has sufficient instructions to be able to reproduce the issue.
+
+## Coding Style  
+See wiki
+
+## License
+By contributing to OpenCellular, you agree that your contributions will be licensed
+under the LICENSE file in the root directory of this source tree.