add issue_template.md (#1878)
add issue_template.md (#1878)

* add issue_template.md

* improve Target Platform examples

* ask to specify the usage of Apple/Google for iOS

pjamrozowicz/react-native-maps,pjamrozowicz/react-native-maps,wannyk/react-native-maps,zigbang/react-native-maps,lelandrichardson/react-native-maps,lelandrichardson/react-native-maps,wannyk/react-native-maps,zigbang/react-native-maps,wannyk/react-native-maps,wannyk/react-native-maps,pjamrozowicz/react-native-maps,zigbang/react-native-maps,lelandrichardson/react-native-maps