docs: Processing Kafka messages with Windmill Perpetual scripts (#2859)

* docs: Processing Kafka messages with Windmill Perpetual scripts

* Add while loop and update readme

* move README to blog post

examples/deploy/kafka-job-adapter/README.md

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+Service script pattern in Windmill
+==================================
+
+See [Blog Post](https://www.windmill.dev/blog/service-script-kafka)

examples/deploy/kafka-job-adapter/docker-compose.yml

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+version: "3.7"
+
+services:
+  zookeeper:
+    image: zookeeper
+
+  kafka:
+    image: ubuntu/kafka
+    environment:
+      - TZ=UTC
+      - ZOOKEEPER_HOST=zookeeper
+      - ZOOKEEPER_PORT=2181
+    depends_on:
+      zookeeper:
+        condition: service_started
+  db:
+    image: postgres:14
+    volumes:
+      - db_data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: changeme
+      POSTGRES_DB: windmill
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  windmill_server:
+    image: ghcr.io/windmill-labs/windmill:main
+    deploy:
+      replicas: 1
+    ports:
+      - 8000:8000
+    environment:
+      - DATABASE_URL=postgres://postgres:changeme@db/windmill?sslmode=disable
+      - MODE=server
+    depends_on:
+      db:
+        condition: service_healthy
+
+  windmill_worker:
+    image: ghcr.io/windmill-labs/windmill:main
+    pull_policy: always
+    deploy:
+      replicas: 3
+    restart: unless-stopped
+    environment:
+      - DATABASE_URL=postgres://postgres:changeme@db/windmill?sslmode=disable
+      - MODE=worker
+      - WORKER_GROUP=default
+    depends_on:
+      db:
+        condition: service_healthy
+
+volumes:
+  db_data: null