Add GitHub issue template.

.github/ISSUE_TEMPLATE.md

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+
+Feel free to write an issue in your preferred format, however if in doubt, use
+the following checklist as a guide for what to include.
+
+* Have you tried the latest master version from Git?
+* Mention your host and target OS and versions
+* Mention your host and target Python versions
+* If reporting a performance issue, mention the number of targets and a rough
+  description of your workload (lots of copies, lots of tiny file edits, etc.)
+* If reporting a crash or hang in Ansible, please rerun with -vvvv and include
+  the last 200 lines of output, along with a full copy of any traceback or
+  error text in the log. Beware "-vvvv" may include secret data! Edit as
+  necessary before posting.
+* If reporting any kind of problem with Ansible, please include the Ansible
+  version along with output of "ansible-config dump --only-changed".