Add queues wrangler dev example

2022-09-queues/.gitignore

@@ -0,0 +1 @@
+node_modules/

2022-09-queues/README.md

@@ -0,0 +1,37 @@
+# Queues Blog Demo
+
+This repo contains an early preview of Cloudflare Queues running in `wrangler dev` local mode.
+
+In this example, the worker script accepts incoming HTTP requests via the `fetch()` handler, and places the request bodies onto a Queue.
+The Queue batches messages (up to a configured time or size limit), and then invokes the script's `queue()` handler with the messages.
+See `wrangler.toml` for the configuration.
+
+In this example, the `queue()` handler simply logs the messages, and invokes a simulated `slowRunningTask()`.
+The `slowRunningTask()` is hard-coded to fail 25% of the time, to illustrate the Queue's ability to redeliver messages upon failures.
+
+## Getting Started
+
+First install the dependencies via `npm`. This includes a custom version of a `wrangler` containing the Queues preview.
+
+```bash
+npm ci
+```
+
+## Running the local dev server
+
+```bash
+npx wrangler dev -l
+```
+
+## Sending requests
+
+Send a single request to the server via curl:
+
+```
+curl localhost:8787 -d "hello"
+```
+
+Send requests with an incrementing counter once per second:
+```
+npm run simple_load
+```