Add application file

app.py

@@ -0,0 +1,12 @@
+import streamlit as st
+
+def greeting(name):
+  st.write(f"Hello, {name}!")
+
+st.title("My first Streamlit app")
+st.text("This is a simple app that greets the user.")
+
+name = st.text_input("What is your name?")
+
+if name:
+  greeting(name)