Add usage description

app.py

@@ -83,6 +83,10 @@ def refresh():
     return image, image
 
 with gr.Blocks(css=css, elem_classes=['container']) as demo:
+    md = gr.Markdown(value="""- To check model performance choose first and second image from available examples.
+                - You can pair up images of the same or different fingerprints. The result from model will be automatically calculated.
+                - Additionally displayed confidence shows the similarity between images. The closer to 0, the more similar - more confident model
+                - Access is granted if value of confidence is below certain threshold found during model testing.""")
     with gr.Row():
         
         with gr.Row():