Return installation using laravel new to docs (laravel#8163)

* Return installation using `laravel new` to docs

* Update installation.md

Co-authored-by: Taylor Otwell <[email protected]>

Author: osmianski

installation.md

@@ -56,6 +56,14 @@ After you have installed PHP and Composer, you may create a new Laravel project
 composer create-project laravel/laravel example-app
 ```
 
+Or, you may create new Laravel projects by globally installing the Laravel installer via Composer:
+
+```nothing
+composer global require laravel/installer
+
+laravel new example-app
+```
+
 After the project has been created, start Laravel's local development server using the Laravel's Artisan CLI `serve` command:
 
 ```nothing