Update Docker & Kubernetes/Docker/Docker Compose/Keycloak.md

Docker & Kubernetes/Docker/Docker Compose/Keycloak.md

@@ -4,6 +4,25 @@
 - [Original Reference Deployment Video](https://www.youtube.com/watch?v=6ye4lP9EA2Y)
 - [Theme Customization Documentation](https://www.baeldung.com/spring-keycloak-custom-themes)
 
+## Keycloak Authentication Sequence
+``` mermaid
+sequenceDiagram
+    participant User
+    participant Traefik as Traefik Reverse Proxy
+    participant Keycloak
+    participant Services
+
+    User->>Traefik: Access service URL
+    Traefik->>Keycloak: Redirect to Keycloak for authentication
+    User->>Keycloak: Provide credentials for authentication
+    Keycloak->>User: Return authorization token/cookie
+    User->>Traefik: Send request with authorization token/cookie
+    Traefik->>Keycloak: Validate token/cookie
+    Keycloak->>Traefik: Token/cookie is valid
+    Traefik->>Services: Forward request to services
+    Services->>Traefik: Response back to Traefik
+    Traefik->>User: Return service response
+```
 
 ## Docker Configuration