feat: add empty tts module

src/modules/tts-modes/none.ts

@@ -0,0 +1,11 @@
+import { TTSModule, TTSResponse } from '../tts';
+
+const ttsNone: TTSModule = {
+	name: 'None',
+	getVoices: async (): Promise<Array<string>> => [],
+	generate: async (): Promise<TTSResponse> => {
+		return { data: Buffer.from([]) };
+	}
+};
+
+export default ttsNone;