Add Versity S3 Gateway documentation to README.md, detailing configuration requirements and usage for shared object storage. This addition enhances clarity for users integrating S3-compatible APIs with POSIX directories.

komodo/s3/versitygw/.env.sample

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+# Versity S3 Gateway — root credentials for the flat-file IAM backend.
+# Copy to `.env` and set strong values before `docker compose up -d`.
+# https://github.com/versity/versitygw/wiki/Quickstart
+
+ROOT_ACCESS_KEY=
+ROOT_SECRET_KEY=
+
+# Host port mapped to the gateway (container listens on 10000).
+VERSITYGW_PORT=10000

komodo/s3/versitygw/compose.yaml

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+# Versity S3 Gateway — POSIX backend over Docker volumes.
+# https://github.com/versity/versitygw
+services:
+  versitygw:
+    image: versity/versitygw:v1.3.1
+    container_name: versitygw
+    restart: unless-stopped
+    environment:
+      - ROOT_ACCESS_KEY=${ROOT_ACCESS_KEY}
+      - ROOT_SECRET_KEY=${ROOT_SECRET_KEY}
+      # Matches Helm chart default; enables `/_/health` for probes.
+      - VGW_HEALTH=/_/health
+    ports:
+      - "${VERSITYGW_PORT:-10000}:10000"
+    volumes:
+      - s3_data:/data/s3
+      - iam:/data/iam
+      - versions:/data/versions
+    command:
+      - "--port"
+      - ":10000"
+      - "--iam-dir"
+      - "/data/iam"
+      - "posix"
+      - "--versioning-dir"
+      - "/data/versions"
+      - "/data/s3"
+    healthcheck:
+      test:
+        [
+          "CMD",
+          "wget",
+          "-qO-",
+          "http://127.0.0.1:10000/_/health",
+        ]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  s3_data:
+  iam:
+  versions: