app change performed

app.py

@@ -0,0 +1,11 @@
+import streamlit as st 
+#
+st.title("Square Estimator Demo")
+# Markdown
+st.markdown("Main Description")
+
+# Slider set-up to store a numerical value
+x = st.slider("Choose a value: ")
+# 
+st.write(x, "the square is ", x * x)
+