Create PULL_REQUEST_TEMPLATE.md

Author: mpeyper

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for your interest in the project. Bugs filed and PRs submitted are appreciated!
+
+Please make sure that you are familiar with and follow the Code of Conduct for
+this project (found in the CODE_OF_CONDUCT.md file).
+
+Also, please make sure you're familiar with and follow the instructions in the
+contributing guidelines (found in the CONTRIBUTING.md file).
+
+If you're new to contributing to open source projects, you might find this free
+video course helpful: http://kcd.im/pull-request
+
+Please fill out the information below to expedite the review and (hopefully)
+merge of your pull request!
+-->
+
+
+**What**:
+
+<!-- What changes are being made? (What feature/bug is being fixed here?) -->
+
+**Why**:
+
+<!-- Why are these changes necessary? -->
+
+**How**:
+
+<!-- How were these changes implemented? -->
+
+**Checklist**:
+
+<!-- Have you done all of these things?  -->
+
+<!--
+To check an item, place an "x" in the box like so: "- [x] Documentation"
+Remove any items that are relevant to your changes
+-->
+
+- [ ] Documentation updated
+- [ ] Tests
+- [ ] Typescript definitions updated
+- [ ] Ready to be merged
+      <!-- In your opinion, is this ready to be merged as soon as it's reviewed? -->
+- [ ] Added myself to contributors table
+      <!-- this is optional, see the contributing guidelines for instructions -->
+
+<!-- feel free to add additional comments -->