Update CONTRIBUTING.md

Author: bambooforest

CONTRIBUTING.md

@@ -1,3 +1,13 @@
 # SegBo: A Database of Borrowed Sounds in the World's Languages
 
-If you are interesting in contributing to SegBo, please contact Eitan Grossman \<[email protected]\>.
+Please use our [issue tracker](https://github.com/segbo-db/segbo/issues) to submit issues encountered with the data or code.
+
+If you are interesting in contributing linguistic data to SegBo, please contact Eitan Grossman \<[email protected]\>.
+
+If you are interested in contributing to the SegBo repository, please use the GitHub fork and pull request workflow, described here:
+
+* https://guides.github.com/activities/forking/
+
+Pull requests can be submitted [here](https://github.com/uzling/100LC/pulls).
+
+