Add PR template

Author: jlukic

.github/PULL_REQUEST_TEMPLATE.md

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+✖ Multiple features in one PR
+✖ New Components Unless Previously Discussed with Maintainers (Consider creating separate repo, I'll link out to you)
+
+✔ Add comments to complex/confusing code in "code" view of PR
+✔ BUGS → This form is required:
+✔ Enhancements → Only specific enhancements with detailed descriptions.
+
+### Issue Titles
+
+Use the format: [Component] Adds Support for Thing
+
+For example: [Build Tools] Adds Source Map Support
+Or: [Button] Fixes Inheritance for Red Basic Active State
+
+### Closed Issues
+#222 #333 #444
+
+### Description
+
+### Testcase
+
+[Show before with this fiddle]
+https://jsfiddle.net/ca0rovs3/
+
+[Consider showing "fixed" case with your fiddle]()
+
+You can link to your JS using https://rawgit.com/
+