BPM Detector with a button

[mercuriete]

As a < type of user >, I want < some goal > so that < some reason >.
Fuking Scrum

I as a product_owner/analyst/developer/tester/user, I want to do a bpm detector so that i can detect BPM

---

OK but now serious
part of the job is actually in develop branch

from the point of the user:
The user can tap a button several times and then in a label the BPM should appear in a label

form the point of the implementation:
The logic takes the user input and should save a system clock timestamp in an array.
Then some time later, the app can calculate the average of the deltas between taps and then we can convert from nanoseconds (period) to beat per minute (frequency).

[mercuriete]

As detected while developing, we need to do the average with only a few timestamps (per example only 5 taps)
Another improvement can be add to the interface a feature to clean the array of timestamps.

[mercuriete]

already done in develop branch.
opening a pull request