add pull request template

.github/pull_request_template.md

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+## Pull Request Template
+
+### Description
+
+[ description of the bug fix or new functionality ]
+
+[ include directions for reviewers if necessary- what or how should they test or review ]
+
+Fixes # (issue(s))
+
+### Corresponding branches and PRs:
+
+[ which branches of wex, lk, and ssc should be built with this PR ]
+
+[ link any corresponding PRs in other repos, i.e. NREL/ssc#x ]
+
+### Unit Test Impact:
+
+[ new tests written? ]
+
+[ expected changes in unit tests or speed of tests? ]
+
+[ expected changes in test_results files? ]
+
+### Checklist
+- [ ] requires help revision and I added that label
+- [ ] adds, removes, modifies, or deletes variables in existing compute modules
+- [ ] adds a new compute module
+- [ ] changes defaults
+- [ ] I've tagged this PR to a milestone
+
+### Reminders- this section can be deleted
+[Checking for PySAM Incompatible API Changes]
+(https://github.com/NREL/SAM/wiki/PySAM-Incompatible-API-Changes-&-Regenerating-PySAM-Files).
+
+[When do the PySAM files need to be regenerated?]
+(https://github.com/NREL/SAM/wiki/PySAM-Incompatible-API-Changes-&-Regenerating-PySAM-Files#when-do-the-pysam-files-need-to-be-regenerated-via-export_config)