Added info for using yarn berry with yarn 3.2.1 (#5169)

* Added info for using yarn berry

* docs update

* docs update

* docs update

* updates

* docs update

* doc updates

Author: Hecatron

documentation/faq/80-integrations.md

@@ -103,6 +103,34 @@ onMount(() => {
 });
 ```
 
-### Does it work with Yarn 2?
+### How do I use with Yarn?
+
+#### Does it work with Yarn 2?
 
 Sort of. The Plug'n'Play feature, aka 'pnp', is broken (it deviates from the Node module resolution algorithm, and [doesn't yet work with native JavaScript modules](https://github.com/yarnpkg/berry/issues/638) which SvelteKit — along with an [increasing number of packages](https://blog.sindresorhus.com/get-ready-for-esm-aa53530b3f77) — uses). You can use `nodeLinker: 'node-modules'` in your [`.yarnrc.yml`](https://yarnpkg.com/configuration/yarnrc#nodeLinker) file to disable pnp, but it's probably easier to just use npm or [pnpm](https://pnpm.io/), which is similarly fast and efficient but without the compatibility headaches.
+
+#### How do I use with Yarn 3?
+
+Currently ESM Support within the latest Yarn (version 3) is considered [experimental](https://github.com/yarnpkg/berry/pull/2161).
+
+The below seems to work although your results may vary.
+
+First create a new application:
+```sh
+yarn create svelte myapp
+cd myapp
+```
+
+And enable Yarn Berry:
+```sh
+yarn set version berry
+yarn install
+```
+
+**Yarn 3 global cache**
+
+One of the more interesting features of Yarn Berry is the ability to have a single global cache for packages, instead of having multiple copies for each project on the disk. However, setting `enableGlobalCache` to true causes building to fail, so it is recommended to add the following to the `.yarnrc.yml` file:
+```
+nodeLinker: node-modules
+```
+This will cause packages to be downloaded into a local node_modules directory but avoids the above problem and is your best bet for using version 3 of Yarn at this point in time.