create a quickstart code

app.py

@@ -0,0 +1,12 @@
+import gradio as gr
+
+def greet(name, intensity):
+        return "hello, " + name + "!" * int(intensity)
+
+demo = gr.Interface(
+    fn=greet,
+    input=["text", "slider"],
+    output=["text"],
+)
+
+demo.launch()