Added missing HttpMethod enum

src/Container/HttpMethod.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Container;
+
+enum HttpMethod: string
+{
+    case GET = 'GET';
+    case POST = 'POST';
+    case PUT = 'PUT';
+    case DELETE = 'DELETE';
+    case HEAD = 'HEAD';
+    case OPTIONS = 'OPTIONS';
+
+    public static function fromString(string $method): self
+    {
+        return match (strtoupper($method)) {
+            'GET' => self::GET,
+            'POST' => self::POST,
+            'PUT' => self::PUT,
+            'DELETE' => self::DELETE,
+            'HEAD' => self::HEAD,
+            'OPTIONS' => self::OPTIONS,
+            default => throw new \InvalidArgumentException("Invalid HTTP method: $method"),
+        };
+    }
+}