Create ISSUE_TEMPLATE.md

Add a basic and initial template.

ISSUE_TEMPLATE.md

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+<!--
+	For bug reports, please fill out the below fields and provide as much detail
+	as possible about your issue.  For feature requests, you may omit the
+	following template.
+-->
+### Host operating system: output of `uname -a`
+
+### flexlm_exporter version: output of `flexlm_exporter --version`
+<!-- If building from source, run `make` first. -->
+
+### flexlm_exporter command line flags and relevant YAML configuration file information
+<!-- Please list all of the command line flags -->
+
+### Are you running flexlm_exporter in Docker?
+
+### What did you do that produced an error?
+
+### What did you expect to see?
+
+### What did you see instead?