Add ReplyOnStopWords (#35)

* add code

* fix dependencies

* add code:

backend/gradio_webrtc/__init__.py

@@ -4,6 +4,8 @@ from .credentials import (
     get_twilio_turn_credentials,
 )
 from .reply_on_pause import AlgoOptions, ReplyOnPause, SileroVadOptions
+from .reply_on_stopwords import ReplyOnStopWords
+from .speech_to_text import stt, stt_for_chunks
 from .utils import AdditionalOutputs, audio_to_bytes, audio_to_file, audio_to_float32
 from .webrtc import StreamHandler, WebRTC
 
@@ -17,7 +19,10 @@ __all__ = [
     "get_twilio_turn_credentials",
     "get_turn_credentials",
     "ReplyOnPause",
+    "ReplyOnStopWords",
     "SileroVadOptions",
+    "stt",
+    "stt_for_chunks",
     "StreamHandler",
     "WebRTC",
 ]