Add .github/ with PR and issue templates

Closes #121

moduleroot/.github/ISSUE_TEMPLATE.md

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+Please check the following items before submitting an issue -- thank you!
+
+- [ ] There is no existing issue or PR that addresses this problem
+
+Optional but makes our lives much easier:
+
+- [ ] The issue affects the latest release of this module
+
+- - -
+
+Please erase this part and provide a complete description of your issue. It
+should roughly contain the following information:
+
+* Affected module version, i.e: 5.0.1
+* Affected OS distribution and version, i.e: Ubuntu 14.04
+* Puppet version, i.e: Puppet 4.5.1
+* How you installed Puppet, i.e: from gem, distribution packages,
+  Puppetlabs AIO
+* How the bug got triggered, i.e: I included the class and set parameter `x`
+  to `y`, or I added `a::resource { 'thing': x => 'y'}` to my manifests
+* What output you got, the complete error message and anything else
+* What behaviour you expected instead, i.e: I wanted to create an apt
+  source entry pointing containing

moduleroot/.github/PULL_REQUEST_TEMPLATE.md

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+Please check the following items before submitting a PR -- thank you!
+
+If this PR tries to address multiple issues please split the PR out in a new
+PR per feature/issue, unless that's not possible because of how the code builds
+on top of each other. In that case ensure every feature/fix and its associated
+tests and documentation are squashed into a distinct commit.
+
+- [ ] There is no existing PR that addresses this problem
+- [ ] Mentioned any existing issues in your commit so they get linked and
+  closed once this PR gets merged, i.e: `Closes #1554` in te body of a commit
+- [ ] Followed the instructions in the [Contributing](CONTRIBUTING.md) document
+- [ ] Ran the unit/spec tests and ensured they still pass
+- [ ] Added tests to cover the new behaviour
+- [ ] Updated the documentation to match the changes
+- [ ] Squashed your PR down to a single commit
+
+Optional but extra points:
+
+- [ ] Added tests to ensure the old behaviour cannot accidentally be
+  reintroduced
+
+- - -
+
+Please erase this and provide further information about your PR.
+It should contain all the necessary information for the maintainers to be
+able to understand the issue at hand and the code behind fixing it.