Proposed update to issue template

A similar template to this one has been successfully used in the \platform repo and can help increase quality of submissions

ISSUE_TEMPLATE.md

@@ -1,9 +1,30 @@
-First of all, please read `CONTRIBUTING.md`.
+For feature requests, please see: http://www.mattermost.org/feature-requests/.
+For troubleshooting questions, please post on the forums: http://forum.mattermost.org/.
+
+For issues with the desktop app, please first read [CONTRIBUTING.md(https://github.com/mattermost/desktop/blob/master/CONTRIBUTING.md), then post here in the following format:
 
 ---
 
-When you have a trouble, please write below.
-- Operationg system
+#### Summary
+
+Issue in one concise sentence
+
+#### Steps to reproduce
+
+Please include
+- Operating system
 - Mattermost desktop app version
 - Mattermost server version
-- How to reproduce the trouble
+- Clear steps to reproduce the issue
+
+#### Expected behavior
+
+Describe your issue in detail
+
+#### Observed behavior
+
+What did you see happen? Please include relevant error messages and/or screenshots.
+
+#### Possible fixes
+
+If you can, link to the line of code that might be responsible for the problem