Add Streamlit demo

app.py

@@ -1,12 +1,6 @@
+# app.py
 import streamlit as st
 
-st.title("Spatial Parser Demo")
-
-password = st.text_input("Enter access password:", type="password")
-
-if password != "demo1234":
-    st.warning("Please enter the correct password to continue.")
-    st.stop()
-
-# 👇真实内容放在这下面
-st.write("Welcome to the demo!")
+st.title("Spatial Parse Demo")
+x = st.slider('Select a value')
+st.write(x, 'squared is', x * x)