Set up simple command for osu

youmubot-osu/src/discord/commands.rs

@@ -0,0 +1,16 @@
+use super::*;
+use youmubot_prelude::*;
+
+/// osu!-related command group.
+#[poise::command(slash_command, subcommands("top"))]
+pub async fn osu<U: HasOsuEnv>(_ctx: CmdContext<'_, U>) -> Result<()> {
+    Ok(())
+}
+
+/// Returns top plays for a given player.
+///
+/// If no osu! username is given, defaults to the currently registered user.
+#[poise::command(slash_command)]
+async fn top<U: HasOsuEnv>(ctx: CmdContext<'_, U>, username: Option<String>) -> Result<()> {
+    todo!()
+}