Initial CONTRIBUTING doc

Author: cmlccie

CONTRIBUTING.md

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+Contribution
+------------
+
+[ciscosparkapi](https://github.com/CiscoDevNet/ciscosparkapi) is a community
+development project.  Feedback, thoughts, ideas and code contributions are
+most welcome!
+
+**How to contributed feedback, issues, thoughts and ideas...**
+
+Please use the [issues](https://github.com/CiscoDevNet/ciscosparkapi/issues) 
+log. to report issues or post ideas for enhancement or discussion.
+
+**Interested in contributing code?**
+
+1. Check for open [issues] or create a new 'issue' for the item you want to work on, and make sure to comment and let us know that you are working on it.
+2. Fork a copy of the repository.
+3. Add your code to your forked repository.
+4. We follow PEP8 fairly strictly for this project.  Please make sure your code passes the lint tests (we use `flake8` for linting). Just run `make lint`.
+5. Submit a **pull request**.  If everything looks good, we will gladly merge your request.