add description

app.py

@@ -34,7 +34,10 @@ demo = gr.Interface(
     query_image,
     inputs=[gr.Image()],
     outputs="image",
-    title="doc-ufcn generic page Demo",
+    title="doc-ufcn Page Detection Demo",
+    description="A demo showing the top prediction from the [Teklia/doc-ufcn-generic-page]("
+    "https://huggingface.co/Teklia/doc-ufcn-generic-page) model."
+    "The generic page detection model predicts single pages from document images. ",
 )
 
 demo.launch()