Add github issue template

Author: manuquentin

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,27 @@
+# Bug report
+
+- [ ] I've checked the [example](https://github.com/react-native-webrtc/react-native-callkeep/tree/master/example) to reproduce the issue.
+
+- Reproduced on:
+ - [ ] Android
+ - [ ] iOS
+
+## Description
+
+
+## Steps to Reproduce
+
+
+## Versions
+    - Callkeep:
+    - React Native:
+    - iOS:
+    - Android:
+    - Phone model: 
+
+
+## Logs
+
+```
+Paste here
+```