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

composer.json

@@ -15,9 +15,7 @@
         "php": "^8.1",
         "ext-json": "*"
     },
-    "bin": [
-        "pm-convert"
-    ],
+    "bin": ["pm-convert"],
     "autoload": {
         "psr-4": {
             "PmConverter\\": "src\\"
@@ -30,5 +28,8 @@
         "optimize-autoloader": true,
         "preferred-install": "dist",
         "sort-packages": true
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^10.3"
     }
 }