update README

Signed-off-by: Takumi Yanagawa <yana@jp.ibm.com>

Author: yana1205

README.md

@@ -1,2 +1,32 @@
-# ITBench-Tools
-Code repository for tools as part of ITBench
+# IT-Bench Tools
+
+This repository provides a toolkit for [ITBench](https://github.com/IBM/itbench), including the containerized components used to run and evaluate agents.
+
+## 🎞️ Components
+
+- **bench-runner**: Executes benchmark scenarios.
+- **agent-harness**: Wraps agents for interaction with IT Bench Service.
+
+## 🛠️ Build and Push (Multi-Arch)
+
+```bash
+bench_runner_name="icr.io/agent-bench/bench-runner-base:0.0.1"
+agent_harness_name="icr.io/agent-bench/agent-harness-base:0.0.1"
+
+# Build and push bench-runner base image
+docker buildx build --platform linux/amd64,linux/arm64 \
+  -f ./docker/bench-runner/Dockerfile \
+  -t ${bench_runner_name} \
+  . --push
+
+# Build and push agent-harness base image
+docker buildx build --platform linux/amd64,linux/arm64 \
+  -f ./docker/agent-harness/Dockerfile \
+  -t ${agent_harness_name} \
+  . --push
+```
+
+## 📝 Notes
+
+- Make sure `docker buildx` is installed and configured with a builder that supports multi-platform builds.
+- You need to be logged in to the container registry (`icr.io`) before pushing.