Import PULL_REQUEST_TEMPLATE.md.

.github/PULL_REQUEST_TEMPLATE.md

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+
+Thanks for creating a PR! Here's a quick checklist to pay attention to:
+
+* Please add an entry to ``docs/changelog.rst`` as appropriate.
+
+* Has some new parameter been added or semantics modified somehow? Please
+  ensure relevant documentation is updated in ``docs/ansible.rst`` and
+  ``docs/api.rst``.
+
+* If it's for new functionality, is there at least a basic test in either
+  ``tests/`` or ``tests/ansible/`` covering it?
+
+* If it's for a new connection method, please try to stub out the
+  implementation as in ``tests/data/stubs/``, so that construction can at least
+  be tested without having a full configruation.
+