Ajout command handler et premier module (ping)

Sean/Modules/PingModule.cs

@@ -0,0 +1,14 @@
+using Discord.Commands;
+using System.Threading.Tasks;
+
+namespace Sean.Modules
+{
+    public class PingModule : ModuleBase<SocketCommandContext>
+    {
+        #region Methods
+        [Command("ping")]
+        [Summary("Ping pong !")]
+        public Task PongAsync() => ReplyAsync("Pong !");
+        #endregion Methods
+    }
+}