Add readme in web (#10855)

### What problem does this PR solve?

As title

### Type of change

- [x] Documentation Update

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

web/README.md

@@ -0,0 +1,23 @@
+## Install front-end dependencies
+
+   ```bash
+   npm install
+   ```
+
+## Launch front-end
+
+   ```bash
+   npm run dev
+   ```
+
+   _The following output confirms a successful launch of the system:_
+
+   ![](https://github.com/user-attachments/assets/0daf462c-a24d-4496-a66f-92533534e187)
+
+## Shutdown front-end
+
+   Ctrl + C or
+
+   ```bash
+   kill -f "umi dev"
+   ```