Added prependPrefix to Group class & updated documentation.

src/Pecee/SimpleRouter/Route/IGroupRoute.php

@@ -53,6 +53,14 @@ interface IGroupRoute extends IRoute
      */
     public function setDomains(array $domains): self;
 
+    /**
+     * Prepend url
+     *
+     * @param string $url
+     * @return static
+     */
+    public function prependUrl(string $url): self;
+
     /**
      * Set prefix that child-routes will inherit.
      *

src/Pecee/SimpleRouter/Route/RouteGroup.php

@@ -153,6 +153,17 @@ class RouteGroup extends Route implements IGroupRoute
         return $this;
     }
 
+    /**
+     * Prepend prefix
+     *
+     * @param string $url
+     * @return static
+     */
+    public function prependUrl(string $url): IGroupRoute
+    {
+        return $this->setPrefix(rtrim($url, '/') . $this->prefix);
+    }
+
     /**
      * Set prefix that child-routes will inherit.
      *