docs: add full control build

Author: axiaoan

README.md

@@ -82,6 +82,85 @@ import { useFetch } from 'vite-ssr-vue3'
 const counts = await useFetch('counts', () => Promise.resolve([1, 2, 3]))
 ```
 
+### Full Control Build
+
+`vite-ssr build` command default equals build client and server, so you can customize your build process.
+
+```diff
+{
+  "scripts": {
++   "build": "vite-ssr build",
+-   "build:client": "vite build --ssrManifest --outDir dist/client",
+-   "build:server": "vite build --ssr src/main.ts --outDir dist/server",
+  },
+}
+```
+
+vite-ssr support separate options for client and server building, Configure them for separate builds
+
+```ts
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  ssrOptions: {
+    // Client build options
+    clientConfig: {},
+    // Server build options
+    serverConfig: {},
+  },
+})
+```
+
+Compiled with `vite-ssr build`, there are three ways to start the server:
+
+1. Run `vite-ssr --mode production`
+2. Use vite-ssr built-in express server, then run `node ./bin/www`
+
+    ```js
+    // ./bin/www.js
+    const { startExpressServer: startServer } = require('vite-ssr-vue3/server')
+    const { createApp } = require('../dist/server/main.cjs')
+
+    startServer({ createApp })
+    ```
+
+3. Customize server
+
+   // TODO
+
+In the above three ways, we need to strongly depend on the server, although we can use `ssr.noExternal` to package dependencies, but the server cannot be packaged in, you must install server package `npm install express`
+
+we can modify the server building entry file to avoid this, create a new file to wrapper your server instance(*`vite-ssr` will not works*), configure `ssr.noExternal: /./` to package all dependencies. if you want to runing anywhere, this is recommended.
+
+```ts
+// src/server.ts
+import { startExpressServer as startServer } from 'vite-ssr-vue3/server'
+import { createApp } from './main'
+
+startServer({ createApp, root: __dirname, outDir: '..' })
+```
+
+```ts
+// vite.config.noexternal.ts
+import type { UserConfig } from 'vite'
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  ssrOptions: {
+    serverConfig: {
+      build: {
+        ssr: './src/server',
+      },
+      ssr: {
+        noExternal: /./,
+      },
+    },
+  },
+} as UserConfig)
+```
+
+then run `vite-ssr build:noexternal`, wait for a while, now you can run `node dist/server/server.cjs` (Required right path) to start the server anywhere.
+
 ## Thanks
 
 Lots of references to the following repos.