Function deltachat::securejoin::join_securejoin

pub async fn join_securejoin(context: &Context, qr: &str) -> Result<ChatId>

Take a scanned QR-code and do the setup-contact/join-group/invite handshake.

This is the start of the process for the joiner. See the module and ffi documentation for more details.

The function returns immediately and the handshake will run in background.