Create CONTRIBUTE.md

CONTRIBUTE.md

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+# Contribute to ClearMap
+
+ClearMap is an actively developed package and we welcome community development and involvement. 
+
+We are especially seeking people from underrepresented backgrounds in OSS to contribute their expertise 
+and experience. Please get in touch if you want to discuss specific contributions you are interested
+in developing, and we can help shape a road-map.
+
+We are happy to receive code extensions, bug fixes, documentation updates, etc.
+
+If you want to contribute to the code, please make a pull request that includes both a summary of and changes to:
+
+* how you modified the code and what new functionality it has
+* the OS it has been tested on
+* a working example of how it works for users.
+
+If you have any questions, please reach out: clearmap.idisco@gmail.com