Add note about Yarn 2 support. (#21657)

As we saw some confusion with users trying out Yarn 2 and hitting roadblocks in their app. Yarn 2 is supported on a best-effort basis.
vercel · Jan 29, 2021 · 843252b · 843252b
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commit 843252b
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diff --git a/docs/getting-started.md b/docs/getting-started.md
@@ -41,6 +41,8 @@ npm install next react react-dom
 yarn add next react react-dom
 ```
 
+> **Note**: [Yarn 2](https://yarnpkg.com/getting-started/install) is supported as best-effort within Next.js. For best results, use NPM or Yarn 1.
+
 Open `package.json` and add the following `scripts`:
 
 ```json