Create ISSUE_TEMPLATE.md

Added template for GitHub issue

.github/ISSUE_TEMPLATE.md

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+#### Expected behaviour                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
+
+#### Actual behaviour                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
+
+#### Steps to reproduce                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
+
+#### iOS version
+
+#### App version
+