Add issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,13 @@
+If you have a usage or support question, come join our [Gitter](https://gitter.im/JRCLUST/community) and ask your question there.
+If you found a bug, please provide **all** of the following:
+
+#### Output of `ver`
+
+#### Output of `gpuDevice`
+
+#### The command you used
+(e.g., `jrc detect-sort myparam.prm`)
+
+#### If manually sorting, what it is you tried to do
+
+#### Console output