add meetup announcement for Rust Rhein Main in March#6455

bdillo merged 1 commit intorust-lang:masterrust-lang/this-week-in-rust:masterfrom

christophbeberweil:rust_rhein_main_2025-03-26christophbeberweil/this-week-in-rust:rust_rhein_main_2025-03-26Copy head branch name to clipboard