Create generic PR template

🎉

Author: BrianThomasRoss

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Thank you for your work, and taking the time to submit your contribution! Make sure you have read the guidelines for contributing available here: https://codeforphilly.github.io/chime/CONTRIBUTING.html ---!>
+
+### Pull Request Checklist
+
+- [ ] Submitted under the correct tag
+- [ ] Runs without error or warning
+- [ ] Documentation  revised /  included
+- [ ] Unit tests included
+- [ ] Issues referenced
+
+---
+
+
+### References
+<!--- Include the issues or other pull requests that this pull requests addresses, make sure to use keywords e.g. Fixes #123, #125. Also see #117 so that the issues close automatically as your PR is merged https://github.blog/2013-05-14-closing-issues-via-pull-requests/ ---!>
+
+
+
+### Explanation
+<!--- Explain your pull request here, try to be descriptive and specific when sharing your thought process / justifications ---!>
+
+
+
+
+### Additional Thoughts