Add object-oriented license client library (v0.0.2)

- Add LicenseClient with PSR-3 logging and PSR-6 caching support
- Add DTO classes: LicenseInfo, LicenseStatus, ActivationResult
- Add LicenseState enum for license status values
- Add comprehensive exception hierarchy for error handling
- Add PSR dependencies (psr/log, psr/cache, psr/http-client)
- Update README with usage examples
- Update CHANGELOG for v0.0.2

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

CLAUDE.md

@@ -29,9 +29,16 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 
 No known bugs at the moment
 
+### Version 0.0.2
+
+- Create an object oriented client-library for the API endpoints
+- Add Logging and caching
+- Keep in mind, that the security related parts of the client MUST be obfuscatable while keeping the developer experience nice. Do not obfuscate it yet.
+
 ## Technical Stack
 
 - **Language:** PHP 8.3.x
+- **PHP-Standards:** PSR-3, PSR-4, PSR-6, PSR-18
 - **Coding-Style:** Symfony
 - **HTTP-Client-Library:** symfony/http-client
 - **Dependency Management:** Composer