added new scripts to package.json for additional commands

package.json

    "android": "react-native run-android",
    "ios": "react-native run-ios",
    "start": "react-native start",
    "test": "jest",
    "lint": "tslint src/**/*.ts",
    "tslint": "./node_modules/.bin/tslint --format stylish --config ./tslint.json 'src/{,**/}*.tsx'",
    "tsc": "tsc",
    "clean": "rimraf build",
    "build": "yarn run clean && yarn run tsc --",
    "watch": "yarn run build -- -w",
    "watchAndRunAndroid": "concurrently \"yarn run watch\" \"yarn run android\"",
    "buildRunAndroid": "yarn run build && yarn run watchAndRunAndroid ",
    "watchAndRunIOS": "concurrently \"yarn run watch\" \"yarn run ios\"",
    "buildRunIOS": "yarn run build && yarn run watchAndRunIOS ",
    "watchAndStart": "concurrently \"yarn run watch\" \"yarn run start\"",
    "buildAndStart": "yarn run build && yarn run watchAndStart "