To build apk or start locally:
npm i
cordova plugin add https://github.com/nostrband/nostr-keystore-cordova-plugin.git
cordova platform add android
cordova build android
apk file will be generated to nostr-band-cordova/platforms/android/app/build/outputs/apk/debug/app-debug.apk
To start application locally open nostr-band-cordova/platforms/android package in android studio and start app