first app.py update

app.py

@@ -0,0 +1,10 @@
+import streamlit as st
+
+# Main script that Streamlit runs. 
+# Individual pages are in the 'pages' folder.
+st.set_page_config(page_title="Data Processing Interface", layout="wide")
+st.title("Data Processing Interface")
+
+# The content of this script can be minimal, as the pages are defined in separate files.
+st.write("Please navigate to the sections using the sidebar.")
+