Merge pull request #50 from aauss/contrib_file

Add contribution file

CONTRIBUTING.rst

@@ -0,0 +1,14 @@
+Contribution
+============
+Thank you for considering to contribute!
+
+If you want to contribute, feel free to open a pull request.
+`This <https://akrabat.com/the-beginners-guide-to-contributing-to-a-github-project/>`_ manual is a good start on how to
+contribute to open source projects.
+
+Please write tests for the features you want to add and make sure to not add dependencies on additional libraries
+(if avoidable).
+We highly appreciate bug fixes (or reports), improvements on the documentation, and tests.
+However, we would be hesitant to add new annotators.
+If you have an idea for a new annotator we would be happy to reference your annotator in a separate repository
+or PyPI package.