docs: improve the github issue template for the repo

Author: Brocco

.github/ISSUE_TEMPLATE.md

@@ -1,23 +1,30 @@
-> Please provide us with the following information:
-> ---------------------------------------------------------------
+<!--
+IF YOU DON'T FILL OUT THE FOLLOWING INFORMATION YOUR ISSUE MIGHT BE CLOSED WITHOUT INVESTIGATING
+-->
+### Bug Report or Feature Request (mark with an `x`)
+- [ ] bug report -> please search issues before submitting
+- [ ] feature request
 
-### OS?
-> Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
+### Versions (if bug report).
+<!--
+Output from: `ng --version`.
+If nothing, output from: `node --version` and include OS details.
+  Windows (7/8/10). Linux (incl. distribution). macOS (El Capitan? Sierra?)
+-->
 
 
-### Versions.
-> Please run `ng --version`. If there's nothing outputted, please run in a Terminal: `node --version` and paste the result here:
+### Repro steps (if bug report).
+<!-- Steps to reproduce this bug. -->
 
 
-### Repro steps.
-> Was this an app that wasn't created using the CLI? What change did you do on your code? etc.
+### The log given by the failure (if bug report).
+<!-- Normally this include a stack trace and some more information. -->
 
 
-### The log given by the failure.
-> Normally this include a stack trace and some more information.
+### Desired functionality (if feature).
+<!-- What would like to see implemented? -->
 
 
 ### Mention any other details that might be useful.
+<!-- Please include a link to the repo if this is related to an OSS project. -->
 
-> ---------------------------------------------------------------
-> Thanks! We'll be in touch soon.