Add Built with Cloudflare button

This PR adds a page with usage guides for the "Built with Cloudflare" button.

Author: kristianfreeman

src/content/docs/workers/platform/built-with.mdx

@@ -0,0 +1,40 @@
+---
+title: Built with Cloudflare button
+pcx_content_type: concept
+sidebar:
+  order: 6
+head: []
+description: Set up a Built with Cloudflare button
+---
+
+import { WranglerConfig } from "~/components";
+import { Tabs, TabItem } from "@astrojs/starlight/components";
+
+If you're building an application or website on Cloudflare, you can embed a Built with Cloudflare button in your README, blog post, or documentation.
+
+![Built with Cloudflare](https://workers.cloudflare.com/built-with-cloudflare.svg)
+
+## How to Set Up Built with Cloudflare button
+
+The Built with Cloudflare button is an SVG and can be embedded anywhere. Use the following snippet to paste the button into your README, blog post, or documentation.
+
+<Tabs syncKey="BuiltWithCloudflareButtonSnippet">
+<TabItem label="Markdown">
+```md
+[![Built with Cloudflare](https://workers.cloudflare.com/built-with-cloudflare.svg)](https://cloudflare.com)
+```
+
+</TabItem>
+<TabItem label="HTML">
+```html
+<a href="https://cloudflare.com"><img src="https://workers.cloudflare.com/built-with-cloudflare.svg" alt="Built with Cloudflare"/></a>
+```
+
+</TabItem>
+
+<TabItem label="URL">
+```
+https://workers.cloudflare.com/built-with-cloudflare.svg
+```
+</TabItem>
+</Tabs>