Timeular Public API activities tracking

main.rs

    if !activities.is_empty() {
            println!("starting to track...");
            let tracking = start_tracking(&activities.get(0).expect("exists").id, &token).await?;
            println!("started tracking: {:?}", tracking);
            let time_entry = stop_tracking(&token).await?;
            println!("created time entry: {:?}", time_entry);
    }