Add templates for Github contributions

Improve the quality of submitted Pull Request descriptions and Issues by
including a template for use by Github.

Author: christopher-hopper

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,19 @@
+## Problem/Motivation
+
+> (Why the issue was filed)
+
+## Expected behaviour
+
+> (What you expected to happen)
+
+## Actual behaviour
+
+> (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

@@ -0,0 +1,7 @@
+## Proposed Changes
+
+> (Describe the changes and rationale behind them)
+
+## Related Issues
+
+> ([Github link](https://help.github.com/articles/autolinked-references-and-urls/) to related issues or pull requests)