chore: Add Tailwind setup instructions for v3 and v4 to README (#4636)

Updated README.md to include configuration steps for integrating Tailwind v3 and v4 with the package. This ensures users can correctly set up Tailwind for compatibility with RJSF and shadCN components.

Author: tuanphung2308

packages/shadcn/README.md

@@ -93,6 +93,20 @@ Follow shadCN installation guide [here](https://ui.shadcn.com/docs/installation)
 
 The color of the RJSF will automatically apply with your shadCN config.
 
+#### Tailwind v3
+Add the following line to your tailwind.config.ts
+```typescript
+  content: [
+    "./src/**/*.{html,js}",
+    "node_modules/@rjsf/shadcn/src/**/*.{js,ts,jsx,tsx,mdx}" // Add this line
+  ],
+```
+#### Tailwind v4
+Add the following line to your equivalent global.css
+```css
+@source "../node_modules/@rjsf/shadcn";
+```
+
 ### Not using Tailwind
 
 #### Use the theme on demo site