AMADEUS: Add the amadeus-rs project into the lektor project

src/rust/amadeus-rs/.gitignore

src/rust/amadeus-rs/.gitlab-ci.yml

src/rust/amadeus-rs/Cargo.toml

src/rust/amadeus-rs/LICENSE

src/rust/amadeus-rs/README.md

src/rust/amadeus-rs/amadeus-macro/Cargo.toml

src/rust/amadeus-rs/amadeus-macro/src/lib.rs

src/rust/amadeus-rs/amadeus/Cargo.toml

src/rust/amadeus-rs/amadeus/src/action/action.rs

src/rust/amadeus-rs/amadeus/src/action/menu.rs

src/rust/amadeus-rs/amadeus/src/action/mod.rs

src/rust/amadeus-rs/amadeus/src/amadeus.rs

src/rust/amadeus-rs/amadeus/src/cards/card.rs

src/rust/amadeus-rs/amadeus/src/cards/collection.rs

src/rust/amadeus-rs/amadeus/src/cards/mod.rs

src/rust/amadeus-rs/amadeus/src/constants.rs

src/rust/amadeus-rs/amadeus/src/logger.rs

src/rust/amadeus-rs/amadeus/src/main.rs

src/rust/amadeus-rs/amadeus/src/playlists.rs

src/rust/amadeus-rs/amadeus/src/utils/config.rs