Add Android Build Release command

Author: andreazllin

example/package.json

@@ -7,6 +7,7 @@
     "ios": "react-native run-ios",
     "start": "react-native start",
     "build:android": "cd android && ./gradlew assembleDebug --no-daemon --console=plain -PreactNativeArchitectures=arm64-v8a",
+    "build:android:release": "cd android && ./gradlew app:assembleRelease && cd ..",
     "build:ios": "cd ios && xcodebuild -workspace GetRandomValuesExample.xcworkspace -scheme GetRandomValuesExample -configuration Debug -sdk iphonesimulator CC=clang CPLUSPLUS=clang++ LD=clang LDPLUSPLUS=clang++ GCC_OPTIMIZATION_LEVEL=0 GCC_PRECOMPILE_PREFIX_HEADER=YES ASSETCATALOG_COMPILER_OPTIMIZATION=time DEBUG_INFORMATION_FORMAT=dwarf COMPILER_INDEX_STORE_ENABLE=NO"
   },
   "dependencies": {