Initial composer setup

This allows installation of the extension

.gitignore

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+/.Build/
+/composer.lock
+/vendor/

composer.json

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+{
+    "name": "werkraummedia/thuecat",
+    "description": "Integration of ThueCat into TYPO3 CMS.",
+    "type": "typo3-cms-extension",
+    "license": "GPL-2.0-or-later",
+    "homepage": "https://github.com/werkraum-media/thuecat",
+    "support": {
+        "email": "coding@daniel-siepmann.de",
+        "source": "https://github.com/werkraum-media/thuecat",
+        "issues": "https://github.com/werkraum-media/thuecat/issues"
+    },
+    "authors": [
+        {
+            "name": "Daniel Siepmann",
+            "email": "coding@daniel-siepmann.de"
+        }
+    ],
+    "require": {
+        "typo3/cms-core": "^10.4"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.5",
+        "maglnet/composer-require-checker": "^2.1",
+        "phpspec/prophecy-phpunit": "^2.0",
+        "typo3/testing-framework": "^6.6"
+    },
+    "scripts": {
+        "post-autoload-dump": [
+            "TYPO3\\TestingFramework\\Composer\\ExtensionTestEnvironment::prepare"
+        ]
+    },
+    "extra": {
+        "typo3/cms": {
+            "cms-package-dir": "{$vendor-dir}/typo3/cms",
+            "extension-key": "thuecat",
+            "web-dir": ".Build/web"
+        },
+        "branch-alias": {
+            "dev-main": "1.0.x-dev"
+        }
+    }
+}