Adding the documentation of the new method of biometric plugin

[charlesschaefer]

Description

• What does this PR change? Give us a brief description.
  Adding documentation on how to use the new method of the biometric plugin, biometricCipher().

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[vasfvitor]

Ae, thanks for this. Have you tested this code yourself?

[vasfvitor]

awaiting tauri-apps/plugins-workspace#2454

[charlesschaefer]

Ae, thanks for this. Have you tested this code yourself?

Yes. I've started working on this because I needed the feature for one of my apps. So, during the development time, I was testing it directly on my app or in a purpose built test app. Anyway, It's a good idea to have someone else checking it. Or at least the API changes, just to ensure it's not too opinionated :-)