@dtolnay do you want a top level README that includes a similar blurb as in the rust-quiz repo? e.g.
## License
The quiz questions, explanations, website, and all other intellectual property in this repository are all licensed under the [Creative Commons Attribution-ShareAlike 4.0 International License](https://github.com/dtolnay/rust-quiz/blob/master/LICENSE-CC-BY-SA).
Rust quiz license link: https://github.com/dtolnay/rust-quiz/blob/master/LICENSE-CC-BY-SA
Closes #139
@dtolnay do you want a top level README that includes a similar blurb as in the rust-quiz repo? e.g.