feat: add ping command

src/commands/general/ping.ts

@@ -0,0 +1,16 @@
+import { ChatInputCommandInteraction, SlashCommandBuilder } from "discord.js";
+import { Command } from "../../commands";
+
+const builder = new SlashCommandBuilder()
+    .setName('ping')
+    .setDescription('Pong.');
+
+const cmd: Command = {
+    name: builder.name,
+    builder: builder,
+    execute: async (interaction: ChatInputCommandInteraction): Promise<void> => {
+        interaction.reply('pong!');
+    }
+};
+
+export default cmd;