docs: Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+<!--
+(Thanks for sending a pull request! Please make sure you click the link above to view the contribution guidelines, then fill out the blanks below.)
+-->
+<!-- Add the issue number that is fixed by this PR (In the form Fixes #123) -->
+
+Fixes #<!--Enter Issue number you have referenced(please refer only one issue at once)-->
+
+#### Checklist
+<!-- Please Star this repository and follow this template for your PR to be considered-->
+- [ ] I have read the SendGrid Contributor License Agreement (CLA)
+- [ ] I have read the [Contribution Guide] and my PR follows them.
+- [ ] My branch is up-to-date with the master branch.
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added necessary documentation (if appropriate)
+<!-- If an existing function does not have a docstring, please add one -->
+- [ ] All the functions created/modified in this PR contain relevant docstrings.
+
+#### Short description of what this resolves:
+
+
+#### Changes proposed in this pull request:
+<!--Fill These Bullet Points-->
+
+
+ If you have questions, please send an email [Sendgrid](mailto:dx@sendgrid.com), or file a Github Issue in this repository.