Add CONTRIBUTORS.rst

contributors.rst

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+Contributor Checklist
+=====================
+
+
+* Create a ``Trac`` ticket, fill it out and assign it to yourself (contact exarkun if you don't have an account):
+
+  ``https://tahoe-lafs.org/trac/tahoe-lafs/newticket``
+
+* Use the ticket number to name your branch (example): 
+
+  ``3003.contributor-guide``
+
+* Good idea to add tests at the same time you write your code.
+
+* Add a file to the ``/newsfragments`` folder, named with the ticket number and the type of patch (example):
+
+  ``newsfragments/3651.minor``
+
+* ``towncrier`` recognizes the following types:
+
+  ``incompat``, ``feature``, ``bugfix``, ``installation``, ``configuration``, ``documentation``, ``removed``, ``other``, ``minor``
+* Add one sentence to ``newsfragments/<ticket-number>.<towncrier-type>`` describing the change (example):
+
+  ``The integration test suite has been updated to use pytest-twisted instead of deprecated pytest APIs.``
+
+* Run the test suite with ``tox``, ``tox -e codechecks`` and ``tox -e typechecks``
+
+* Push your branch to Github with your ticket number in the merge commit message (example):
+
+  ``Fixes ticket:3003``
+
+  This makes the ``Trac`` ticket close when your PR gets approved.
+
+* Request appropriate review.
+
+
+References
+----------
+
+This checklist is a summary of `this page on contributing Patches <https://tahoe-lafs.org/trac/tahoe-lafs/wiki/Patches>`__ 
+
+Before authoring or reviewing a patch, please familiarize yourself with the `Coding Standard <https://tahoe-lafs.org/trac/tahoe-lafs/wiki/CodingStandards>`__ 
+and the `Contributor Code of Conduct <docs/CODE_OF_CONDUCT.md>`__.

newsfragments/3682.documentation

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+A cheatsheet-style document for contributors was created at CONTRIBUTORS.md