Add an issue template (#1362)

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,13 @@
+<!---
+If needed, you can paste your config and logs on https://gist.github.com and
+include a link in your issue. Post separate problems in separate issues, as
+this makes it easier to keep track of them. These top lines won't appear when
+you create your issue, so make sure to put details at the bottom of the post.
+-->
+
+EssentialsX version (`/essentials`): 
+
+Server software (`/version`): 
+
+EssentialsX config (if applicable): 
+