added the base gradio interface and execution for the file

app.py

@@ -0,0 +1,18 @@
+import gradio as gr
+from summarize import Summarizer
+
+interface = gr.Interface(fn = Summarizer,
+                        inputs = [gr.inputs.Textbox(lines=2, 
+                                                    placeholder="Enter your link...",
+                                                    label='YouTube Video Link'),
+                                  gr.inputs.Radio(["mT5", "BART"], type="value", label='Model')],
+                        outputs = [gr.outputs.Textbox(
+                                                      label="Summary")],
+                         
+                        title = "Youtube Video Summarizer",
+                        examples = [
+                                   ['https://www.youtube.com/watch?v=WSbgixdC9g8', 'BART']
+                                   ],
+                        enable_queue=True)
+
+interface.launch(debug=True)