Added sail documentation

Author: rennokki

docs/basic-usage/sail.md

@@ -0,0 +1,24 @@
+---
+title: Laravel Sail
+order: 5
+---
+
+# Run in Laravel Sail
+
+To be able to use Laravel Websockets in Sail, you should just forward the port:
+
+```yaml
+# For more information: https://laravel.com/docs/sail
+version: '3'
+services:
+    laravel.test:
+        build:
+            context: ./vendor/laravel/sail/runtimes/8.0
+            dockerfile: Dockerfile
+            args:
+                WWWGROUP: '${WWWGROUP}'
+        image: sail-8.0/app
+        ports:
+            - '${APP_PORT:-80}:80'
+            - '${LARAVEL_WEBSOCKETS_PORT:-6001}:${LARAVEL_WEBSOCKETS_PORT:-6001}'
+```