Create ISSUE_TEMPLATE.md

Author: ZoranPandovski

ISSUE_TEMPLATE.md

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+### Subject of the issue
+Describe your issue here.
+
+### Your environment
+* version of angular-translate
+* version of angular
+* which browser and its version
+
+### Steps to reproduce
+Tell us how to reproduce this issue. Please provide a working demo, you can use [this template](https://plnkr.co/edit/XorWgI?p=preview) as a base.
+
+### Expected behaviour
+Tell us what should happen
+
+### Actual behaviour
+Tell us what happens instead