Adds chatroom example using DO hibernation API

15-chatroom/README.md

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+# WebSocket chatroom
+
+## How to Run
+
+First ensure that `uv` is installed:
+https://docs.astral.sh/uv/getting-started/installation/#standalone-installer
+
+Now, if you run `uv run pywrangler dev` within this directory, it should use the config
+in `wrangler.jsonc` to run the example.
+
+You can also run `uv run pywrangler deploy` to deploy the example.
+
+Navigate to `http://localhost:8787` to see the chatroom.

15-chatroom/package.json

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+{
+	"name": "python-websocket-stream-consumer",
+	"version": "0.0.0",
+	"private": true,
+	"scripts": {
+		"deploy": "uv run pywrangler deploy",
+		"dev": "uv run pywrangler dev",
+		"start": "uv run pywrangler dev"
+	},
+	"devDependencies": {
+		"wrangler": "^4.50.0"
+	}
+}

15-chatroom/pyproject.toml

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+[project]
+name = "python-chatroom"
+version = "0.1.0"
+description = "Python WebSocket chatroom example"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "webtypy>=0.1.7",
+]
+
+[dependency-groups]
+dev = [
+    "workers-py",
+    "workers-runtime-sdk"
+]