Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+
+
+## Issue Description
+
+```
+ENTER DESCRIPTION HERE
+```
+
+## Screenshots
+
+```
+ADD YOUR SCREENSHOTS HERE (It will be extremly helpfull)
+```
+
+## Environment
+
+####react-native-navigation version:
+```INSERT VERSION HERE```
+
+####react-native version:
+```INSERT VERSION HERE```
+
+####Device details
+- [ ] Android
+- [ ] iOS
+
+Simulator / Device: ```INSERT HERE```
+
+OS Version: ```INSERT HERE```
+