### Quick Start: Add and Download a Torrent

Source: https://docs.rs/librqbit/latest/librqbit/index.html

This example demonstrates the basic usage of librqbit to create a session, add a torrent from a magnet link, and wait for it to complete. Ensure you have the `tokio` runtime available for async operations.

```rust
use librqbit::*;

tokio_test::block_on(async {
    let session = Session::new("/tmp/where-to-download".into()).await.unwrap();
    let managed_torrent_handle = session.add_torrent(
       AddTorrent::from_url("magnet:?xt=urn:btih:cab507494d02ebb1178b38f2e9d7be299c86b862"),
       None // options
    ).await.unwrap().into_handle().unwrap();
    managed_torrent_handle.wait_until_completed().await.unwrap()
})
```

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