Architektur hinzugefügt

Architektur.md

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+# Architektur
+
+## Grobe Architektur
+```mermaid
+flowchart
+k["IAM (SZUT Keycloak)"]
+a["Administration (Angular)"]
+c["Client (Redot) /<br> Companion App (Angular)"]
+steam["IAM (Steam)"]
+s["Server (Springboot)"]
+
+a-->|administrative actions|s
+a-->|login|k
+k-->|authenticates|a
+s-->|verify user|k
+
+c-->|login|steam
+steam-->|authenticates|c
+c-->|connects to WS|s
+s<-->|session|c
+```