Update issue templates

Author: phongcao

.github/ISSUE_TEMPLATE/issue-template.md

@@ -0,0 +1,33 @@
+---
+name: Issue template
+about: Issue template
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Report
+
+- [ ] I have searched [existing issues](https://github.com/CatalystCode/react-native-azurenotificationhub/issues) and this is not a duplicate.
+
+## Environment
+
+<!-- Which platforms does this issue apply (Android/iOS/Windows)? -->
+- Platforms: 
+<!-- [Android] Which version of Android? -->
+- Android version:
+<!-- [iOS] Which version of iOS? -->
+- iOS version:
+
+## Issues and Steps to Reproduce
+***Replaces this with steps to repro your issue, if applicable.***
+
+## Expected Behavior
+***Describe what you expected would happen.***
+
+## Actual Behavior
+***Describe what actually happened. Include screenshots, if applicable.***
+
+## Link to Code
+***If you have some code that maintainers can clone/test for themselves, bugs can be resolved much faster. Please paste a link here.***