Update app.py to have gradio.

app.py

@@ -171,7 +171,9 @@ def input_multimodel(image=None, audio=None, text=None, query=None):
         return process[1]
     else: 
         return process[0]
-        
+
+import gradio as gr 
+
 title = "Multi-Model Phi-2 "
 description = "A simple Gradio interface to use a Multi-model (image, text, audio) version of Microsoft Phi-2"