Invite bot to server / group for #8.

src/routes/bots/mod.rs

@@ -1,9 +1,11 @@
 use rocket::Route;
 
 mod create;
+mod invite;
 
 pub fn routes() -> Vec<Route> {
     routes![
-        create::create_bot
+        create::create_bot,
+        invite::invite_bot
     ]
 }