[Queues] Addd an example to demo HTTP Push

Author: sdnts

src/content/docs/queues/examples/publish-to-a-queue-via-http.mdx

@@ -0,0 +1,40 @@
+---
+title: Publish to a Queue via HTTP
+summary: Publish to a Queue directly via HTTP.
+pcx_content_type: example
+sidebar:
+  order: 31
+head:
+  - tag: title
+    content: Queues - Publish Directly via HTTP
+description: Publish to a Queue directly via HTTP and Workers.
+---
+
+The following example shows you how to publish messages to a Queue from any HTTP client, using a Cloudflare API token to authenticate.
+
+This allows you to write to a Queue from any service or programming language that supports HTTP, including Go, Rust, Python or even a Bash script.
+
+### Prerequisites
+
+- A [queue created](/queues/get-started/#3-create-a-queue) via the [Cloudflare dashboard](https://dash.cloudflare.com) or the [wrangler CLI](/workers/wrangler/install-and-update/).
+- A Cloudflare API token with the `Queues Edit` permission.
+
+
+### 1. Send a test message
+
+To make sure you successfully authenticate and write a message to your queue, use `curl` on the command line:
+
+```sh
+# Make sure to replace the placeholder with your shared secret
+curl -XPOST -H "Authorization: Bearer <paste-your-api-token-here>" "https://api.cloudflare.com/client/v4/accounts/<paste-your-account-id-here>/queues/<paste-your-queue-id-here>/messages" --data '{ "body": { "greeting": "hello" } }'
+```
+
+```sh output
+{"success":true}
+```
+
+This will issue a HTTP POST request, and if successful, return a HTTP 200 with a `success: true` response body.
+
+- If you receive a HTTP 403, this is because your API token is invalid or does not have the `Queues Edit` permission.
+
+For full documentation about the HTTP Push API, refer to the [Cloudflare API documentation](https://developers.cloudflare.com/api/resources/queues/subresources/messages/).