Update message builder and add a test command.

cogs/commands/__init__.py

@@ -0,0 +1,16 @@
+"""
+Cog loader. Adds all command cogs to the bot.
+"""
+
+from nextcord.ext import commands
+
+from cogs.commands.test import TestCog
+
+
+# This function will be called when this extension is loaded.
+# It is necessary to add these functions to the bot.
+def setup(bot: commands.Bot):
+    """
+    Adds all command classes to bot.
+    """
+    bot.add_cog(TestCog(bot))