Add initial Keycloak setup with custom theme and Docker configuration

- Created .env.example for environment variable configuration.
- Added .gitignore to exclude .env files.
- Introduced docker-compose files for Keycloak and Postgres services.
- Implemented custom Keycloak theme 'drill-luxe' with associated templates and styles.
- Updated README with deployment instructions and repository details.

docker-compose.yml

@@ -0,0 +1,61 @@
+services:
+  keycloak-postgres:
+    image: postgres:16
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      PGDATA: /var/lib/postgresql/data/pgdata
+    expose:
+      - "5432"
+    networks:
+      - internal
+    volumes:
+      - keycloak_postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+      start_period: 20s
+
+  keycloak:
+    build:
+      context: ./keycloak
+      dockerfile: Dockerfile
+    restart: unless-stopped
+    command: start
+    environment:
+      KC_DB: postgres
+      KC_DB_URL: jdbc:postgresql://keycloak-postgres:5432/${POSTGRES_DB}
+      KC_DB_USERNAME: ${POSTGRES_USER}
+      KC_DB_PASSWORD: ${POSTGRES_PASSWORD}
+      KC_BOOTSTRAP_ADMIN_USERNAME: ${KC_BOOTSTRAP_ADMIN_USERNAME}
+      KC_BOOTSTRAP_ADMIN_PASSWORD: ${KC_BOOTSTRAP_ADMIN_PASSWORD}
+      KC_HOSTNAME: https://${KC_PUBLIC_HOSTNAME}
+      KC_HOSTNAME_STRICT: "true"
+      KC_HTTP_ENABLED: "true"
+      KC_PROXY_HEADERS: xforwarded
+      KC_METRICS_ENABLED: "true"
+      KC_HEALTH_ENABLED: "true"
+    expose:
+      - "8080"
+      - "9000"
+    networks:
+      - proxy
+      - internal
+    depends_on:
+      keycloak-postgres:
+        condition: service_healthy
+
+volumes:
+  keycloak_postgres_data:
+    external: true
+    name: keycloak_postgres_data
+
+networks:
+  proxy:
+    external: true
+  internal:
+    driver: bridge