feat: add Keycloak service deployment manifest and setup documentation

keycloak/README.md

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+docker stack deploy -c keycloak.yml keycloak

keycloak/keycloak.yml

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+version: '3.8'
+
+services:
+  keycloak:
+    image: quay.io/keycloak/keycloak:latest
+    command: start --optimized
+    environment:
+      KC_DB: postgres
+      KC_DB_URL: jdbc:postgresql://postgres-db:5432/keycloak
+      KC_DB_USERNAME: postgres
+      KC_DB_PASSWORD: 98836
+      KC_HOSTNAME: auth.emrekirman.com # Kendi domaininizle değiştirin
+      KC_PROXY: edge # Reverse proxy (Nginx/Traefik) arkasındaysanız gerekli
+      KEYCLOAK_ADMIN: admin
+      KEYCLOAK_ADMIN_PASSWORD: eE24619840420*
+    ports:
+      - target: 8080
+        published: 8080
+        protocol: tcp
+        mode: host
+    networks:
+      - postgres_network
+      - keycloak-net
+    deploy:
+      replicas: 2
+      update_config:
+        parallelism: 1
+        delay: 10s
+      restart_policy:
+        condition: on-failure
+
+volumes:
+  postgres_data:
+networks:
+  postgres_network:
+    external: true
+  keycloak-net:
+    external: true