Modified Issue_Template to be more descriptive (#729)

* Modified Issue_Template to be more descriptive

* Some minor changes to Description field

Author: max-mironov

.github/ISSUE_TEMPLATE.md

@@ -1,10 +1,20 @@
 Thanks so much for filing an issue or feature request! Please fill out the following (wherever relevant):
 
+### Description
+
+[FILL THIS OUT: Explain what you did, what you expected to happen, and what actually happens. Also exact reproduction steps and stack trace will be much appreciated.]
+
+### Reproduction
+
+[FILL THIS OUT: If possible try to reproduce your bug on our basic sample: https://github.com/Microsoft/react-native-code-push/tree/master/Examples/CodePushDemoApp. If you can't reproduce the bug on it, provide us as much info as possible about your project.]
+
+### Additional Information
+
 * react-native-code-push version:
 * react-native version:
 * iOS/Android/Windows version:
 * Does this reproduce on a debug build or release build?
 * Does this reproduce on a simulator, or only on a physical device?
-* Repro steps and/or stack trace:
 
 (The more info the faster we will be able to address it!)
+