Add getting-started publish and subscribe examples

Add documentation examples for the getting-started guide:
- Publish example showing basic message publishing
- Subscribe example showing basic subscription handling

These examples use NATS-DOC-START/END markers for extraction
to the documentation site.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Jarema

examples/docs/getting-started-publish/index.ts

@@ -0,0 +1,19 @@
+import { connect, StringCodec } from '@nats-io/transport-node';
+
+// Connect to NATS
+const nc = await connect({ servers: 'localhost:4222' });
+console.log('Connected to NATS');
+
+// Create encoder
+const sc = StringCodec();
+
+// NATS-DOC-START
+// Publish messages
+nc.publish('hello', sc.encode('Hello NATS!'));
+nc.publish('hello', sc.encode('Welcome to messaging'));
+// NATS-DOC-END
+
+console.log('Messages published');
+
+// Close connection
+await nc.close();

examples/docs/getting-started-subscribe/index.ts

@@ -0,0 +1,19 @@
+import { connect, StringCodec } from '@nats-io/transport-node';
+
+// Connect to NATS
+const nc = await connect({ servers: 'localhost:4222' });
+console.log('Connected to NATS');
+
+// Create decoder
+const sc = StringCodec();
+
+// NATS-DOC-START
+// Subscribe to 'hello'
+const sub = nc.subscribe('hello');
+console.log('Waiting for messages...');
+
+// Process messages
+for await (const msg of sub) {
+  console.log(`Received: ${sc.decode(msg.data)}`);
+}
+// NATS-DOC-END