Update README.md

Author: GodwinShen

README.md

@@ -17,7 +17,7 @@
 
 This repository provides a simple Flask app that (a) performs user authentication with a KeyCloak server using the OIDC Authorization Code Flow and then (b) forward proxies authenticated user requests to a web-app running on the same server.  This Flask app must be running locally on the same server as this web-app, e.g., web-app is running as a set of containers running on a docker network.  The KeyCloak authN endpoint is assumed to be deployed already. 
 
-[TODO: Add a diagram that shows (a) a KeyCloak server, (b) a server with a Flask app and a web app running on it, (c) Flask app forwarding on http://localhost:{some_port} to the web app, (d) OIDC authN flow between the Flask app and the KeyCloak server.]
+![](/Users/gshen/Downloads/AMMOS_In_The_Cloud_Diagrams-Simple_Flask_Auth_Adapter.png "Flask OIDC auth flow with KeyCloak")
 
 ## Features