Add issue and pull request templates for GitHub

Addresses #573

These templates are a ripoff of those written by [@ErisDS] for [Ghost].

TryGhost/Ghost@e5afddf

[@ErisDS]: https://github.com/ErisDS
[Ghost]: https://github.com/TryGhost/Ghost

Author: whmii

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,22 @@
+Welcome to Neat! 👋🎉
+
+Do you need help or have a question? Please check out Neat on [Stack Overflow]. Got an idea for a new feature or found a bug? Please fill out the sections below... thank you 👍
+
+[Stack Overflow]: https://stackoverflow.com/questions/tagged/neat
+
+### Issue Summary
+
+A summary of the issue and the browser/OS environment in which it occurs.
+
+### Steps to Reproduce
+
+1. This is the first step
+2. This is the second step, etc.
+
+Any other info, for example, why you consider this to be a bug? What did you expect to happen instead?
+
+### Technical details:
+
+- Neat Version:
+- Build Tool or Environment:
+- Browser/OS:

.github/PULL_REQUEST_TEMPLATE.md

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+Got some code for us? Awesome 🎊!
+
+Please include a description of your change and the problem it solves. Then check your PR against this list. Thanks!
+- [ ] Commit message has a short title & issue references
+- [ ] Commits are squashed
+- [ ] The build will pass (run `bundle exec rake`).
+
+More info can be found by clicking the "guidelines for contributing" link above.