Update README.md

Author: GodwinShen

README.md

@@ -15,7 +15,7 @@
 
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-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. 
+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 deployed as a set of containers running on a docker network.  The KeyCloak authN endpoint is assumed to be deployed already.  The user authentication and request forwarding flow is shown in the diagram below.
 
 ![Flask OIDC auth flow with KeyCloak](AMMOS_In_The_Cloud_Diagrams-Simple_Flask_Auth_Adapter.png "Flask OIDC auth flow with KeyCloak")