chore: README

README.md

@@ -3,17 +3,28 @@
 This is a ChatGPT web application demo with express and vue3
 
 ![cover](./docs/cover.png)
-## Intro
+## Usage
-1. `node >= 18`
+> Make sure `node >= 18`
-1. `pnpm install` node deps
-2. set `OPENAI_API_KEY` in `.env`
 
-## Run
+install node deps
+```shell
+pnpm install
+```
+
+Sign up for an [OpenAI API key](https://platform.openai.com/overview) and store it in your environment.
+
+```
+# .env
+OPENAI_API_KEY="Your Key"
+```
+
+Run service
 ```shell
-# 1. run service
 pnpm run service
+```
 
-# 2. run web
+Run web
+```shell
 pnpm run dev
 ```