###NOTE### project.json and google-service.json not included

npm install

npx react-native run-android

If some of the libraries make trouble go -> node_modules/specificlibrary/android/build.gradle

Add this line

buildFeatures {
    buildConfig true
}

in to the files android{} block. Also, if the same library makes trouble again, add their namespace in android{} block again if it doesn't exist already.