Add the tts feature into app

app.py

@@ -8,9 +8,23 @@ import json
 import os
 import random
 import openai
-
+from gtts import gTTS
+from io import BytesIO
 
 openai.api_key = os.getenv("OPENAI_KEY")
+# https://gtts.readthedocs.io/en/latest/
+#
+def tts_gtts(text):
+    mp3_fp = BytesIO()
+    tts = gTTS(text, lang="en")
+    tts.write_to_fp(mp3_fp)
+    return mp3_fp
+
+def pronounce(text):
+    if len(text) > 0:
+        data = tts_gtts(text)
+        return data
+    return []
 
 @st.cache_resource
 def load_model():
@@ -141,9 +155,14 @@ def mispronounciation_detection_section():
 
                 st.divider()
 
-                # display more prompts to practice -- 1 from ChatGPT -- based on user's mistakes, 2 from L2 Arctic
                 st.write('#### What is next?')
 
+                # display pronounciation e.g.
+                st.write("Here is a pronounced sample")
+                pronounced_sample = pronounce(text)
+                st.audio(pronounced_sample, format="audio/wav", start_time=0)
+
+                # display more prompts to practice -- 1 from ChatGPT -- based on user's mistakes, 2 from L2 Arctic
                 st.write('Here are some more prompts for you to practice:')
 
                 selected_prompts = []