Added link to the main readme (#44)

Nyholm · web-flow · commit 49e7febff38e · 2021-04-29T11:57:44.000+02:00
diff --git a/README.md b/README.md
@@ -2,6 +2,8 @@
 
 A runtime for [Laravel](https://laravel.com/).
 
+If you are new to the Symfony Runtime component, read more in the [main readme](https://github.com/php-runtime/runtime).
+
 ## Installation
 
 ```
