Update app.py

app.py

@@ -1,3 +1,18 @@
 import streamlit as st
+import time
 
-st.markdown("Hello World")
+def main():
+    st.title("Streamlit Example")
+
+    st.write("Waiting for 5 seconds...")
+    time.sleep(5)
+    st.write("Completed!")
+
+    uploaded_file = st.file_uploader("Upload a file")
+
+    if uploaded_file is not None:
+        content = uploaded_file.read().decode("utf-8")
+        st.markdown(content)
+
+if __name__ == "__main__":
+    main()