docs: Add usage documentation to the readme

Author: jespertheend

README.md

@@ -13,3 +13,34 @@ Renda comes with an online editor called [Renda Studio](https://renda.studio)
 where you can easily build your scenes and adjust parameters to your liking.
 
 For more information, visit [rendajs.org](https://rendajs.org/).
+
+## Usage
+
+It is recommended to start out with the editor over at https://renda.studio.
+Check out the
+[getting started guide](https://rendajs.org/manual/getting-started) for more
+info.
+
+But if you prefer to use Renda as a library, without using Renda Studio, you can
+import it using the jsDelivr cdn:
+
+```js
+<script type="module">
+	import {Vec3} from "https://cdn.jsdelivr.net/npm/renda@latest/dist/renda.js";
+
+	console.log(new Vec3(1,2,3).magnitude);
+</script>;
+```
+
+Or if you have a build step, you can also use the official
+[npm package](https://npmjs.com/package/renda):
+
+```
+npm i renda
+```
+
+And finally, Renda is also available on
+[deno.land/x](https://deno.land/x/renda).
+
+If you wish to use Renda as library, you can find a
+[getting started guide here](https://www.npmjs.com/package/renda).