Calculation on how much money is saved.

[nowherenearaninja]

Is your feature request related to a problem? Please describe.
Not related to a problem.
Suggestion for improvement

Describe the solution you'd like
Everyone that uses your program saves money. My guess is that it is quite a lot.
Would be interesting to know how much.
Open for any solution. But maybe calculate energy added with its actual cost, and subtract from energy added on the 24hr average. And then present as a metric. Daily/Monthly/Yearly/All time saved

Describe alternatives you've considered
Manual calculation from the Tibber app

Additional context
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