Add integration of Spritmonitor.de

Hello,

I am using a service called "Spritmonitor.de"(https://www.spritmonitor.de/) to track fuel costs and more.
I saw, there is an API available to communicate with the service (https://github.com/FundF/Spritmonitor-API-sample-code)
It would be cool to have this integrated into AAIdrive.
A possibility would be a new settings screen to configure the authentication and select the correct car that is already registered in the service.
Then a option in a new screen would be good, to show the last X entrys for this car. Additionally a button would be good to add a new fuel entry where the current odometer value is filled in automatically.