create env after install

the creation of base .env file that stores global variables for the app
need to be automated, so it's created after composer install
automatically instead of issueing and additional command

composer.json

@@ -71,7 +71,11 @@
         ],
         "post-create-project-cmd": [
             "@php artisan key:generate --ansi"
-        ]
+        ],
+        "post-install-cmd": [
+            "php -r \"copy('.env.example', '.env');\"",
+            "php artisan key:generate"
+          ]
     },
     "extra": {
         "laravel": {