add README.md for bigdl-llm-cpu image (#9026)

* modify Dockerfile

* add README.md

* add README.md

docker/llm/inference/cpu/docker/Dockerfile

@@ -13,6 +13,7 @@ RUN env DEBIAN_FRONTEND=noninteractive apt-get update && \
     ln -s /usr/bin/python3 /usr/bin/python && \
     apt-get install -y python3-pip python3.9-dev python3-wheel python3.9-distutils && \
     pip3 install --no-cache --upgrade requests argparse urllib3 && \
-    pip3 install --pre --upgrade bigdl-llm[all] 
+    pip3 install --pre --upgrade bigdl-llm[all] && \
+    pip3 install --pre --upgrade bigdl-nano
 
 ENTRYPOINT ["/bin/bash"]

docker/llm/inference/cpu/docker/README.md

@@ -0,0 +1,34 @@
+## Build/Use BigDL-LLM cpu image
+
+### Build Image
+```bash
+docker build \
+  --build-arg http_proxy=.. \
+  --build-arg https_proxy=.. \
+  --build-arg no_proxy=.. \
+  --rm --no-cache -t intelanalytics/bigdl-llm-cpu:2.4.0-SNAPSHOT .
+```
+
+
+### Use the image for doing cpu inference
+
+
+An example could be:
+```bash
+#/bin/bash
+export DOCKER_IMAGE=intelanalytics/bigdl-llm-cpu:2.4.0-SNAPSHOT
+
+sudo docker run -itd \
+        --net=host \
+        --cpuset-cpus="0-47" \
+        --cpuset-mems="0" \
+        --memory="32G" \
+        --name=CONTAINER_NAME \
+        --shm-size="16g" \
+        $DOCKER_IMAGE
+```
+
+
+After the container is booted, you could get into the container through `docker exec`.
+
+To run inference using `BigDL-LLM` using cpu, you could refer to this [documentation](https://github.com/intel-analytics/BigDL/tree/main/python/llm#cpu-int4).