Adding a template for GitHub issues.

.github/ISSUE_TEMPLATE.md

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+### What I Did
+
+Please describe what you did, including the clients you used, what errors
+or messages you saw, _etc_.
+
+### What I Expected/Wanted
+
+Please describe what behavior you wanted to achieve, what you expected to see.
+Sometimes the "bug" is simply that ProFTPD is doing something different than
+what you expected, and sometimes the desired behavior can be done using
+different approaches.  And sometimes, knowing what you expected to see helps
+us to better pinpoint the root cause of the problem/issue.
+
+### ProFTPD Version and Configuration
+
+Please help us reproduce the problem/issue you are encountering.  To do this,
+we need to know which version of ProFTPD you are using, how it was built,
+_etc_.  The following command is an easy way to get all of this information:
+
+    $ proftpd -V
+
+In addition, we need to see *all* of the ProFTPD configuration files you are
+using (*minus* any sensitive information like passwords, of course).  Armed
+with the version and configuration data, then, we can set up ProFTPD locally
+using the same configuration, and see what happens.