Update app.py

app.py

@@ -23,7 +23,7 @@ if your_file is not None:
     json_data = json.loads(bytes_data)
 
 else:
-    st.write("Example api file can be located here")
+    st.write("Reference: https://blog.streamlit.io/the-streamlit-agraph-component/")
 
     json_data = get_json("https://raw.githubusercontent.com/insightbuilder/python_de_learners_data/main/code_script_notebooks/python_scripts/json_reader/toplevel_comment_zGAkhN1YZXM.json")
 try: