Add CDN loading example

This is useful for testing out the library - e.g. in a codepen or browser console.

Author: josephrocca

README.md

@@ -61,6 +61,11 @@ const decompressedData = brotli.decompress(compressedData);
 console.log(textDecoder.decode(decompressedData)); // Prints 'some input'
 ```
 
+You can also load it from a CDN like so:
+```javascript
+let brotli = await import("https://unpkg.com/[email protected]/index.web.js?module").then(m => m.default);
+```
+
 The package itself has no runtime dependencies, although if you prefer using `Buffer` over using `TextEncoder/TextDecoder` you may want a [browser Buffer polyfill](https://www.npmjs.com/package/browserify-zlib).
 
 #### In browser with streams: