chore: import upstream snapshot with attribution

examples/hello-world/README.md

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+# Hello World Example
+
+The simplest go-micro service demonstrating core concepts.
+
+## What It Does
+
+This example creates a basic RPC service that:
+- Listens on port 8080
+- Exposes a `Greeter.Hello` method
+- Returns a greeting message
+- Demonstrates both programmatic and HTTP access
+
+## Run It
+
+```bash
+go run main.go
+```
+
+The service will start and make test calls to itself, then wait for incoming requests.
+
+## Test It
+
+### Using curl
+
+```bash
+curl -X POST http://localhost:8080 \
+  -H 'Content-Type: application/json' \
+  -H 'Micro-Endpoint: Greeter.Hello' \
+  -d '{"name": "Alice"}'
+```
+
+Expected response:
+```json
+{"message": "Hello Alice"}
+```
+
+### Using the micro CLI
+
+```bash
+micro call greeter Greeter.Hello '{"name": "Bob"}'
+```
+
+## Code Walkthrough
+
+1. **Define types** - Request and Response structures
+2. **Implement handler** - The `Greeter` service with `Hello` method
+3. **Create service** - Using `micro.NewService()` with options
+4. **Register handler** - Link the handler to the service
+5. **Run service** - Start listening for requests
+
+## Key Concepts
+
+- **RPC Pattern**: Method signature `func(ctx, req, rsp) error`
+- **Service Discovery**: Automatic registration
+- **Multiple Transports**: Works over HTTP, gRPC, etc.
+- **Type Safety**: Strongly typed requests/responses
+
+## Next Steps
+
+- See [pubsub-events](../pubsub-events/) for event-driven patterns
+- See [production-ready](../production-ready/) for a complete example
+- Read the [Getting Started Guide](../../internal/website/docs/getting-started.md)