React Firebase Auth (with React Router v6)

• You can use this as template for your Firebase authentication app
• It also includes routing
• It's code is originally from https://www.youtube.com/watch?v=PKwu15ldZ7k
• I updated the code so it's using React router version 6 (instead of 5) and newest version of Firebase

*** CODE IS INSIDE UPDATEDLIBRARIES BRANCH!!!! ***