Refactorings

- important curl and wget improvements
- initial test coverage
- setters and getters in Request classes
- namespace fixes
- some additions in README
- docblocks and code-style

src/Converters/ConvertFormat.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PmConverter\Converters;
+
+
+use PmConverter\Converters\{
+    Curl\CurlConverter,
+    Http\HttpConverter,
+    Wget\WgetConverter};
+
+enum ConvertFormat: string
+{
+    case Http = HttpConverter::class;
+    case Curl = CurlConverter::class;
+    case Wget = WgetConverter::class;
+}