Add a pull request template form

.github/pull_request_template.md

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+### Description of changes
+
+### Specific notes
+
+Issues Fixed (include github issue #):
+
+Are changes expected to change answers?
+- bit for bit (yes/no)
+- more substantial (yes/no)
+
+Specific changes:
+- changes in parm directory (yes/no)
+- changes in module files (yes/no)
+- new tests added or removed (yes/no)
+
+Testing performed:
+- machines:
+- details:
+
+Hashes used for testing:
+- NEMS:
+- CMEPS:
+- FV3:
+- MOM6:
+- CICE:
+- WW3:
+- FMS:
+- stochastic_physics:
+
+Co-authored by: