Update docs for docs.ohif.org

docs/contributing.md

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 # Contributing
 
-...
+### I would like to contribute code - how do I do this?
+
+Fork the repository, make your change and submit a pull request.
+
+### Any guidance on submitting changes?
+
+While we do appreciate code contributions, triaging and integrating contributed code changes can be very time consuming. Please consider the following tips when working on your pull requests:
+
+- Functionality is appropriate for the repository. Consider posting on the forum if you are not sure.
+- Code quality is acceptable. We don't have coding standards defined, but make sure it passes ESLint and looks like the rest of the code in the repository.
+- Quality of design is acceptable. This is a bit subjective so you should consider posting on the forum for specific guidance.
+- The scope of the pull request is not too large. Please consider separate pull requests for each feature as big pull requests are very time consuming to understand.
+
+We will provide feedback on your pull requests as soon as possible. Following the tips above will help ensure your changes are reviewed.