Push subuser creation service

app/Contracts/Repository/Daemon/ServerRepositoryInterface.php

@@ -36,6 +36,15 @@ interface ServerRepositoryInterface extends BaseRepositoryInterface
      */
     public function create($id, $overrides = [], $start = false);
 
+    /**
+     * Set an access token and associated permissions for a server.
+     *
+     * @param string $key
+     * @param array  $permissions
+     * @return \Psr\Http\Message\ResponseInterface
+     */
+    public function setSubuserKey($key, array $permissions);
+
     /**
      * Update server details on the daemon.
      *