Docs: add Bun install instructions (twbs#41277)

Co-authored-by: Julien Déramond <[email protected]>

Author: 2 people

README.md

@@ -50,6 +50,7 @@ Several quick start options are available:
 - Clone the repo: `git clone https://github.com/twbs/bootstrap.git`
 - Install with [npm](https://www.npmjs.com/): `npm install [email protected]`
 - Install with [yarn](https://yarnpkg.com/): `yarn add [email protected]`
+- Install with [Bun](https://bun.sh/): `bun add [email protected]`
 - Install with [Composer](https://getcomposer.org/): `composer require twbs/bootstrap:5.3.5`
 - Install with [NuGet](https://www.nuget.org/): CSS: `Install-Package bootstrap` Sass: `Install-Package bootstrap.sass`
 

site/content/docs/5.3/getting-started/download.md

@@ -111,6 +111,14 @@ yarn start # Start the project
 ```
 {{< /callout >}}
 
+### Bun
+
+Install Bootstrap in your Bun or Node.js powered apps with [the Bun CLI](https://bun.sh/):
+
+```sh
+bun add bootstrap@{{< param "current_version" >}}
+```
+
 ### RubyGems
 
 Install Bootstrap in your Ruby apps using [Bundler](https://bundler.io/) (**recommended**) and [RubyGems](https://rubygems.org/) by adding the following line to your [`Gemfile`](https://bundler.io/guides/gemfile.html):