Add initial podspec file.
Add initial podspec file.

Polidea/react-native-ble-plx,Polidea/react-native-ble-plx,Polidea/react-native-ble-plx,Polidea/react-native-ble-plx,Polidea/react-native-ble-plx,Polidea/react-native-ble-plx