Initialize composer project for WooCommerce Licensed Product Client

- Set up composer.json with package metadata and PSR-4 autoloading
- Add symfony/http-client ^7.0 as HTTP client dependency
- Create project structure (src/, tests/, tmp/)
- Add README.md with project overview
- Add CHANGELOG.md to track version history
- Add .gitignore for vendor and cache files
- Include OpenAPI specification in tmp/openapi.json

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

composer.json

@@ -0,0 +1,36 @@
+{
+    "name": "magdev/wc-licensed-product-client",
+    "description": "Client library for WooCommerce Licensed Product Plugin - Activate, validate and check the status of licenses via REST API",
+    "type": "library",
+    "license": "GPL-2.0-or-later",
+    "authors": [
+        {
+            "name": "Marco Graetsch",
+            "email": "magdev3.0@gmail.com",
+            "homepage": "https://src.bundespruefstelle.ch/magdev"
+        }
+    ],
+    "homepage": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client",
+    "support": {
+        "issues": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client/issues",
+        "source": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client"
+    },
+    "require": {
+        "php": "^8.3",
+        "symfony/http-client": "^7.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Magdev\\WcLicensedProductClient\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Magdev\\WcLicensedProductClient\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "stable"
+}