Merge pull request #25988 from turtle601/docs/yarn-pnp-create-nodemod…

…ules-message

Docs: add message that storybook creates node_modules in pnp

docs/get-started/install.md

@@ -132,6 +132,10 @@ If you're working with a custom environment set up or need set up Storybook manu
 
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+#### Yarn Plug'n'Play (PnP) support with Storybook
+
+If you've enabled Storybook in a project running on a new version of Yarn with [Plug'n'Play](https://yarnpkg.com/features/pnp) (PnP) enabled, you may notice that it will generate `node_modules` with some additional files and folders. This is a known constraint as Storybook relies on some directories (e.g., `.cache`) to store cache files and other data to improve performance and faster builds. You can safely ignore these files and folders, adjusting your `.gitignore` file to exclude them from the version control you're using.
+
 #### Run Storybook with Webpack 4
 
 If you previously installed Storybook in a project that uses Webpack 4, it will no longer work. This is because Storybook now uses Webpack 5 by default. To solve this issue, we recommend you upgrade your project to Webpack 5 and then run the following command to migrate your project to the latest version of Storybook: