Created ServerInterface for PSR-7 serving standarization.

Author: francerz

Diff for: src/tools/ServerInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Francerz\Http\Tools;
+
+use Psr\Http\Message\ResponseInterface;
+
+interface ServerInterface
+{
+    public function emitResponse(ResponseInterface $response);
+}