Add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Pull Request Etiquette
+
+<!--
+  There are several guidelines you should follow in order for your
+  Pull Request to be merged.
+-->
+
+- [ ] I have checked the PRs for upcoming features/bug fixes.
+
+<!--
+  It is sometimes better to include more changes in a single commit. 
+  If you find yourself having an overwhelming amount of commits, you
+  can **rebase** your branch.
+-->
+
+### Changes
+
+- [ ] Internal code
+- [ ] API (affecting end-user code)
+- [ ] Other: \_____ <!-- Insert other type here -->
+
+<!-- Replace "NaN" with an issue number if this is a response to an issue -->
+
+Closes Issue: NaN
+
+## Description
+
+Replace this sentence with general description of what your Pull Request does.