added sample image as the initial example

app.py

@@ -20,7 +20,7 @@ def filter_preds(image, threshold):
 with gr.Blocks() as interface:
     with gr.Row():
         with gr.Column():
-            image = gr.Image(label="Input")
+            image = gr.Image(label="Input", value="sample/1.jpg")
 
         with gr.Column():
             output = gr.Image(label="Output")