added readme

example/hello-world/README.md

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+# Hello World Plugin Example
+
+A simple KubeStellar UI plugin with WASM backend and React frontend.
+
+## Prerequisites
+
+- **TinyGo** (v0.30.0+) - `brew install tinygo` (macOS) or [download](https://tinygo.org/getting-started/install/)
+- **Node.js** (v18+) - For frontend build
+- **Go** (v1.21+) - For backend development
+
+## Build & Package
+
+```bash
+# 1. Build frontend
+cd frontend
+npm install
+npm run build
+
+# 2. Build WASM backend
+cd ..
+make build
+
+# 3. Package everything
+make package
+```
+
+## Installation
+
+1. Start KubeStellar UI locally
+2. Go to **Plugin Manager** tab
+3. Click **"Install from Local Path"**
+4. Select `plugin.tar.gz`
+5. Click **Install**
+
+## API Endpoints
+
+- `POST /hello` - Returns personalized greeting
+- `GET /status` - Returns plugin health status
+
+## Project Structure
+
+```
+hello-world/
+├── main.go                    # WASM backend
+├── plugin.yml                 # Plugin manifest
+├── Makefile                   # Build automation
+├── hello-world.wasm          # Compiled WASM
+├── plugin.tar.gz             # Final package
+└── frontend/                  # React frontend
+    ├── src/App.jsx           # Main component
+    └── dist/                 # Built assets
+```
+
+## Development
+
+```bash
+# Frontend development
+cd frontend && npm run dev
+
+# Rebuild backend
+make build
+
+# Package for testing
+make package
+```