Feat. Bot initialisation code along with message handling code

src/main.rs

@@ -1,5 +1,29 @@
 use dotenv::dotenv;
-fn main() {
+
+use serenity::async_trait;
+use serenity::model::channel::Message;
+use serenity::prelude::*;
+
+struct Handler;
+
+#[async_trait]
+impl EventHandler for Handler {
+    async fn message(&self, ctx: Context, new_message: Message) {
+        if new_message.content == "!ping" {
+            if let Err(why) = new_message.channel_id.say(&ctx.http, "Pong!").await {
+                println!("Error sending message: {why:?}");
+            }
+        }
+    }
+}
+
+#[tokio::main]
+async fn main() {
     dotenv().ok();
     let token = std::env::var("TOKEN").expect("TOKEN must be set");
+    let intents = GatewayIntents::GUILD_MESSAGES | GatewayIntents::DIRECT_MESSAGES | GatewayIntents::MESSAGE_CONTENT;
+    let mut client = Client::builder(&token, intents).event_handler(Handler).await.expect("Error creating bot.");
+    if let Err(why) = client.start().await {
+        println!("Client error: {why:?}");
+    }
 }