Add installation instructions for yarn, pnpm, and bun package managers (#37)

Updated the README.md to include installation examples for all popular package managers (npm, yarn, pnpm, and bun) to make it easier for users to get started regardless of their tooling preferences.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: clord

README.md

@@ -13,10 +13,20 @@ Features include:
 
 **Requirements:** Node.js 18.0.0 or higher
 
-To install,
+To install, use your preferred package manager:
 
 ```sh
-npm add --save react-enable react
+# npm
+npm install react-enable react
+
+# yarn
+yarn add react-enable react
+
+# pnpm
+pnpm add react-enable react
+
+# bun
+bun add react-enable react
 ```
 
 Then most users will use it in the following manner: