Add description

Signed-off-by: Aisuko <urakiny@gmail.com>

app.py

@@ -2,15 +2,22 @@ import gradio as gr
 import imageio
 
 def dummy(img):
-  imageio.imwrite("output_image.png", img["mask"])
-  return img["image"], img["mask"]
+    imageio.imwrite("output_image.png", img["mask"])
+    return img["image"], img["mask"]
 
 with gr.Blocks() as demo:
-  with gr.Row():
-    img = gr.Image(tool="sketch", label="base image", width=512, height=512, show_label=True)
-    img1 = gr.Image()
-    img2 = gr.Image(label="mask image", show_label=True)
-  btn = gr.Button()
-  btn.click(dummy, img, [img1, img2])
+    gr.Markdown(
+        """
+        # Image mask creator
+        This is a demo of a simple image mask creator. You can draw on the image and the mask will be created.
+        """
+    )
 
-demo.launch(debug=True)
+    with gr.Row():
+       img = gr.Image(tool="sketch", label="base image", width=512, height=512, show_label=True)
+       img1 = gr.Image()
+       img2 = gr.Image(label="mask image", show_label=True)
+    btn = gr.Button()
+    btn.click(dummy, img, [img1, img2])
+
+demo.launch(debug=True)