docs: instructions for TypeScript import (#385)

* Update README.md

* Update README.md

* Update README.md

* Update packages/react-youtube/README.md

Co-authored-by: Rui Saraiva <[email protected]>

* Update packages/react-youtube/README.md

Co-authored-by: Rui Saraiva <[email protected]>

Co-authored-by: Rui Saraiva <[email protected]>

Author: zirho

packages/react-youtube/README.md

@@ -30,6 +30,16 @@ yarn add react-youtube
 pnpm add react-youtube
 ```
 
+### TypeScript (optional)
+
+```
+npm install -D @types/youtube-player
+# OR
+yarn add -D @types/youtube-player
+# OR
+pnpm add -D @types/youtube-player
+```
+
 ## Usage
 
 ```js