Add demos for chat

sdk/webpubsub-chat-client/.yarnrc.yml

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+nodeLinker: node-modules
+
+# Temporary: Use MyGet feed for @azure scoped packages during preview.
+# This will be removed once the package is published to npm.
+npmScopes:
+  azure:
+    npmRegistryServer: "https://www.myget.org/F/azure-signalr-dev/npm/"

sdk/webpubsub-chat-client/examples/battleship/.yarnrc.yml

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+nodeLinker: node-modules
+
+npmScopes:
+  azure:
+    npmRegistryServer: "https://www.myget.org/F/azure-signalr-dev/npm/"

sdk/webpubsub-chat-client/examples/battleship/README.md

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+# Battleship
+
+Multiplayer real-time naval combat. Each player gets a grid with randomly placed ships. Attack any opponent's grid — hits and misses appear instantly for all players. Last fleet standing wins.
+
+## How it works
+
+| Feature | Chat SDK API |
+|---|---|
+| Login | `ChatClient.start(url)` |
+| Create game & invite players | `createRoom(title, playerList)` |
+| Join game via invitation | `onRoomJoined` |
+| Deploy fleet / Fire at opponent | `sendToRoom(roomId, json)` |
+| Real-time attack updates | `onMessage` |
+| Restore game state on rejoin | `listRoomMessages` |
+| See who joined | `onMemberJoined` |
+
+## Prerequisites
+
+1. An Azure Web PubSub resource
+2. Node.js 18+
+
+## Run
+
+```bash
+cd examples/battleship
+yarn install
+node server.js "<your-connection-string>"
+```
+
+Open **multiple browser tabs** at `http://localhost:3000`, login as different users, and start a game.
+
+## How to Play
+
+- Ships are placed **randomly** when you join a game
+- **Free-for-all**: no turns — click any cell on an opponent's board to attack
+- A player is **eliminated** when all their ship cells are hit
+- Last player alive **wins**

sdk/webpubsub-chat-client/examples/battleship/package.json

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+{
+  "name": "battleship-example",
+  "version": "1.0.0",
+  "description": "Real-time multiplayer battleship using Web PubSub Chat SDK",
+  "type": "module",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "author": "Microsoft",
+  "license": "MIT",
+  "dependencies": {
+    "@azure/web-pubsub": "^1.2.0",
+    "@azure/web-pubsub-chat-client": "1.0.0-beta.1",
+    "express": "^5.2.1"
+  }
+}