Update issue_template.md

Add link to Discourse

.github/issue_template.md

@@ -1,8 +1,12 @@
 Hi! Thanks for using the Jupyter Docker Stacks.
 
-If you are looking to contribute to the images, please see the [Contributor's Guide] (http://jupyter-docker-stacks.readthedocs.io/en/latest/#) in the documentation for our preferred processes.
+Please review the following guidance about how to ask questions, contribute changes, or report bugs in the Docker images maintained here.
 
-If you are reporting an issue with one of the existing images, please answer the questions below to help us troubleshoot the problem. Please be as thorough as possible.
+1. If you have a general question about using these Docker images or with Jupyter + Docker in general, please post your question in the [Jupyter Discourse Q&A section](https://discourse.jupyter.org/c/questions) so that it can be seen, discussed, and hopefully answered by the community.
+
+2. If you are looking to contribute to the images, please see the [Contributor's Guide](http://jupyter-docker-stacks.readthedocs.io/en/latest/#) in the documentation for our preferred processes.
+
+3. If you are reporting an issue with one of the existing images, please answer the questions below to help us troubleshoot the problem. Please be as thorough as possible.
 
 **What docker image you are using?**