Add GitHub pull request and issue templates

.github/ISSUE_TEMPLATE.md

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+### Please file issues on Bugzilla.
+If you're here to report an issue, we really appreciate it!
+
+We use https://bugzilla.mozilla.org/ as our primary tool to track new issues. Feel free
+to open a new issue here on GitHub, but bugs reported directly via Bugzilla will likely
+get triaged faster.
+
+You can file a bug for bedrock via the following URL:
+
+https://bugzilla.mozilla.org/enter_bug.cgi?product=www.mozilla.org&component=Pages%20%26%20Content

.github/PULL_REQUEST_TEMPLATE.md

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+### Guidelines
+Before you submit a pull request, please make sure you have done the following:
+
+- [ ] Review the guidelines for contributing to this repository (link above in GitHub ^).
+- [ ] All commit messages should be well written, and reference a Bugzilla bug number where applicable.
+
+Note: If you're unsure about anything here or below, don't worry! Just fill out as much
+information as you can.
+
+## Description
+Please explain the changes you're making, complete with a description of the issue and
+a summary of the proposed solution.
+
+## Bugzilla
+Include a direct link to the associated bug on Bugzilla.
+
+## Testing
+Please leave some directions for the reviewer on how to test your pull request. List which
+pages need attention, and what the reviewer should pay close attention to. If the change
+requires testing in any specific browsers or platforms, please provide a list.
+
+## Checklist
+- [ ] Requires l10n changes.
+- [ ] Related functional & integration tests passing.