✨ Adds GitHub issue & pr templates

.github/ISSUE_TEMPLATE.md

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+# Problem/Motivation
+
+> (Why the issue was filed)
+
+## Expected behavior
+
+> (What you expected to happen)
+
+## Actual behavior
+
+> (What actually happened)
+
+## Steps to reproduce
+
+> (How can someone else make/see it happen)
+
+## Proposed changes
+
+> (If you have a proposed change, workaround or fix,
+> describe the rationale behind it)

.github/PULL_REQUEST_TEMPLATE.md

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+# Proposed Changes
+
+> (Describe the changes and rationale behind them)
+
+## Related Issues
+
+> ([Github link][autolink-references] to related issues or pull requests)
+
+[autolink-references]: https://help.github.com/articles/autolinked-references-and-urls/