update app.py

* adding the credentials to the secrets and using them in the app

app.py

@@ -1,6 +1,12 @@
 import gradio as gr
+import os
+
+
+USERNAME = os.environ.get("USERNAME")
+PASSWORD = os.environ.get("PASSWORD")
+
 
 with gr.Blocks() as demo:
     gr.Markdown("# Welcome to the TradingGEN app")
 
-demo.launch(auth=("admin","admin"))
+demo.launch(auth=(USERNAME,PASSWORD))