add simple mux command

general.rs

@@ -0,0 +1,9 @@
+use serenity::framework::standard::{macros::command, CommandResult};
+use serenity::model::prelude::*;
+use serenity::prelude::*;
+
+#[command]
+pub async fn ping(ctx: &Context, msg: &Message) -> CommandResult {
+    msg.reply(ctx, "Pong!").await?;
+    Ok(())
+}