[ci skip] Add CONTRIBUTING.md

Author: germanattanasio

CONTRIBUTING.md

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+# Questions
+
+If you are having difficulties running the app or have a question about the service, please ask a question on [dW Answers](https://developer.ibm.com/answers/questions/ask/?topics=watson) or [Stack Overflow](http://stackoverflow.com/questions/ask?tags=ibm-watson).
+
+# Issues
+
+If you encounter an issue with this sample app, you are welcome to submit a bug report. Before that, please search for similar issues. It's possible somebody has encountered this issue already.
+
+
+# Pull Requests
+
+If you want to contribute to the repository, here's a quick guide:
+
+1. Fork the repo
+1. Develop your code changes
+1. Ensure `eslint` is happy: `npm run lint`
+1. Ensure the tests pass: `npm test`
+1. Commit your changes
+1. Push to your fork and submit a pull request