Add locally provided PSR-15 interfaces to work against while in draft

composer.json

@@ -20,7 +20,8 @@
     },
     "autoload": {
         "psr-4": {
-            "WellRESTed\\" : "src/"
+            "WellRESTed\\": "src/",
+            "Psr\\Http\\ServerMiddleware\\": "src-fig/"
         }
     }
 }

src-fig/DelegateInterface.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Psr\Http\ServerMiddleware;
+
+interface DelegateInterface extends HandleInterface
+{
+}

src-fig/HandleInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Psr\Http\ServerMiddleware;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+interface HandleInterface
+{
+    public function __invoke(ServerRequestInterface $request): ResponseInterface;
+}
+

src-fig/MiddlewareInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Psr\Http\ServerMiddleware;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+interface MiddlewareInterface
+{
+    public function process(
+        ServerRequestInterface $request,
+        DelegateInterface $delegate): ResponseInterface;
+}