Use MIT license
Use MIT license

From README.md:

> You are free to use and adapt this work in any way you want, with 2 overall principles:
> * Do not hold me or any contributors liable for your actions of using this software.
> * Please do the courtesy of fair acknowledgments if you derive works from it.

The MIT license is a widely-vetted and accepted license with three simple clauses that boil down to exactly what you described.

Explicitly using this license would make the app clean for [F-Droid's Inclusion Policy](https://f-droid.org/wiki/page/Inclusion_Policy).
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