Add message sending.

src/routes/channels/mod.rs

@@ -2,10 +2,12 @@ use rocket::Route;
 
 mod fetch_channel;
 mod delete_channel;
+mod message_send;
 
 pub fn routes() -> Vec<Route> {
     routes![
         fetch_channel::req,
-        delete_channel::req
+        delete_channel::req,
+        message_send::req
     ]
 }