Update Android README file
Update Android README 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