Update readme to present new features

[abarghoud]

You can check the result directly in here

I will work on overriding authentication service to mock firebase api when running the app locally, this way anyone can use pps-easy locally without having to setup firebase env variables.

Done in #14

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[Romain-Portanguen]

A comment about .gitkeep which I don't think is necessary anymore. That aside, perfect 🤩