add example image

app.py

@@ -191,7 +191,7 @@ with gr.Blocks(css=css, theme=gr.themes.Soft()) as demo:
     with gr.Row():
         with gr.Column(elem_id="col-input-image"):
             # gr.Markdown(" ## Drop your image here")
-            input_image = gr.Image(type="pil")
+            input_image = gr.Image(type="pil", value="./hoodie.webp")
         with gr.Column(elem_id="col-container"):
             generate_button = gr.Button("Generate flat sketch", scale=0, variant="primary", elem_classes="btn btn-primary")