Refine the quick start of ChatQnA

ChatQnA/docker_compose/intel/cpu/xeon/README.md

@@ -2,6 +2,66 @@
 
 This document outlines the deployment process for a ChatQnA application utilizing the [GenAIComps](https://github.com/opea-project/GenAIComps.git) microservice pipeline on Intel Xeon server. The steps include Docker image creation, container deployment via Docker Compose, and service execution to integrate microservices such as `embedding`, `retriever`, `rerank`, and `llm`. We will publish the Docker images to Docker Hub soon, it will simplify the deployment process for this service.
 
+# Quick Start
+
+1. Set up the environment variables.
+2. Run Docker Compose.
+3. Consume the ChatQnA Service.
+
+## Quick Start: 1.Setup Environment Variable
+
+To set up environment variables for deploying ChatQnA services, follow these steps:
+
+1. Set the required environment variables:
+
+   ```bash
+   # Example: host_ip="192.168.1.1"
+   export host_ip="External_Public_IP"
+   # Example: no_proxy="localhost, 127.0.0.1, 192.168.1.1"
+   export no_proxy="Your_No_Proxy"
+   export HUGGINGFACEHUB_API_TOKEN="Your_Huggingface_API_Token"
+   ```
+
+2. If you are in a proxy environment, also set the proxy-related environment variables:
+
+   ```bash
+   export http_proxy="Your_HTTP_Proxy"
+   export https_proxy="Your_HTTPs_Proxy"
+   ```
+
+3. Set up other environment variables:
+   ```bash
+   source ./docker_compose/intel/cpu/xeon/set_env.sh
+   ```
+
+## Quick Start: 2.Run Docker Compose
+
+```bash
+cd GenAIExamples/ChatQnA/docker_compose/intel/cpu/xeon/
+docker compose up -d
+```
+
+It will automatically download the docker image on `docker hub`:
+
+```bash
+docker pull opea/chatqna:latest
+docker pull opea/chatqna-ui:latest
+```
+
+If you want to build docker by yourself, please refer to 'Build Docker Images' in below.
+
+> Note: The optional docker image **opea/chatqna-without-rerank:latest** has not been published yet, users need to build this docker image from source.
+
+## QuickStart: 3.Consume the ChatQnA Service
+
+```bash
+curl http://${host_ip}:8888/v1/chatqna \
+    -H "Content-Type: application/json" \
+    -d '{
+        "messages": "What is the revenue of Nike in 2023?"
+    }'
+```
+
 ## 🚀 Apply Xeon Server on AWS
 
 To apply a Xeon server on AWS, start by creating an AWS account if you don't have one already. Then, head to the [EC2 Console](https://console.aws.amazon.com/ec2/v2/home) to begin the process. Within the EC2 service, select the Amazon EC2 M7i or M7i-flex instance type to leverage 4th Generation Intel Xeon Scalable processors that are optimized for demanding workloads.