Outline of the PR template

Still needs a lot of work, but this is probably the right direction.

Author: marshallward

.github/pull_request_template.rst

@@ -1,3 +1,34 @@
-This is a test PR template.
+Thank you for contributing to MOM6!
 
-(Is it really working?)
+Before completing your submission, remember to check the following.
+
+* Have I submitted to the correct repository?
+
+  .. image:: media/select_repo.png
+
+  - mom-ocean is only for nodes
+
+  - If you are unsure, send this PR to NOAA-GFDL/MOM6.git
+
+* Have all CI tests pass?
+
+  - Reach out to XXX if you need help resolving these issues.
+
+* Review the MOM6 code style guide
+
+  Some common errors:
+
+  - Indentation
+
+  - Correct index conventions
+
+  - Parentheses to ensure bit reproducibility
+
+* Commit history
+
+  - Is my work based on the latest version?
+
+    If not, then you may need to update your branch, preferably using ``git
+    rebase``.
+
+  - Are all of my commits meaningful?