For HTTPS forwarding from localhost: (https://ngrok.com/docs/2)
./ngrok http -bind-tls=true 5000
##Useful links:
- https://console.developers.google.com/apis/api/fcm.googleapis.com/overview?project=clubsim-d63ed&duration=PT1H
- https://console.developers.google.com/apis/api/fcm.googleapis.com/overview?project=clubsim-d63ed
- https://firebase.google.com/docs/cloud-messaging/auth-server
- https://stackoverflow.com/questions/41214625/firebase-node-js-error-the-xmlhttprequest-compatibility-library-was-not-foun
- https://stackoverflow.com/questions/43321477/the-script-resource-is-behind-a-redirect-which-is-disallowed
- https://firebase.google.com/docs/auth/web/password-auth
- https://firebase.google.com/docs/cloud-messaging/js/client
- https://developers.google.com/web/tools/chrome-devtools/remote-debugging/
- https://firebase.google.com/docs/reference/js/firebase.database.ThenableReference#set
- https://firebase.google.com/docs/database/web/read-and-write
- http://developine.com/firebase-cloud-messaging-push-notification-android-tutorial/
- http://developine.com/how-to-send-firebase-push-notifications-from-app-server-tutorial/
- https://console.firebase.google.com/project/clubsim-d63ed/notification
- https://firebase.google.com/docs/web/setup