Add GitHub PR and issue templates (#76)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve Wire
+
+---
+
+You can use `go bug` to have a cool, automatically filled out bug template, or
+fill out the template below.
+
+### Describe the bug
+
+A clear and concise description of what the bug is.
+
+### To Reproduce
+
+Steps to reproduce the behavior.
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+### Version
+
+Which version of Wire are you seeing the bug with?
+
+### Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+### Is your feature request related to a problem? Please describe.
+
+A clear and concise description of what the problem is. Ex. I'm always
+frustrated when [...]
+
+### Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've
+considered.
+
+### Additional context
+
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+Please reference any Issue related to this Pull Request. Example: `Fixes #1`.
+
+See
+[here](https://blog.github.com/2015-01-21-how-to-write-the-perfect-pull-request/)
+for tips on good Pull Request description.