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contributing.md

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+# Contributing to the Cell Browser
+
+Thanks for taking the time to contribute!
+
+You've found a bug or have an idea for a feature? 
+Great! You can open an issue in Github. If you don't know that means, just email us
+at cells@ucsc.edu. We are happy about any pull requests. We try to get back to you within 1-2 days, especially on obvious bugs.
+Before you submit a pull request, don't hesitate to ask. Maybe we are already working on it or have some opinion how to 
+best implement something.
+
+## Contribution Guidelines
+
+* Make sure your text editor is set to remove tab characters and replaces them with spaces.
+* We use K&R indentation, camelCase variable names and globals are not uppercase, but don't worry, we can fix up any PRs for you
+* The main Javascript file is src/cbPyLib/cellbrowser/cbWeb/js/cellbrowser.js
+* The main Python code is src/cbPyLib/cellbrowser/cellbrowser.py