Adds an Issue template and a Pull request template to Github

.github/ISSUE_TEMPLATE.md

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+Found a bug? Please fill out the sections below. 👍
+
+### Issue Summary
+
+A summary of the issue.
+
+### Steps to Reproduce
+
+1. This is the first step
+2. This is the second step, etc.
+
+Any other relevant information. For e.g. Why do you consider this a bug and what did you expect to happen instead?
+
+### Technical details
+
+* Python version:
+* Django version:
+* Wagtail version:
+* Browser version:

.github/PULL_REQUEST_TEMPLATE.md

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+### Thanks for contributing to Wagtail! 🎉
+
+Please review [the contributor guidelines](http://docs.wagtail.io/en/latest/contributing/index.html) and confirm that [the tests pass](http://docs.wagtail.io/en/latest/contributing/developing.html#testing) in case of Python changes.