1.2.2

docs: remove README.md file

Remove the comprehensive README.md documentation file that contained installation instructions, usage examples, authentication methods, and advanced configuration options for the Kard Java SDK.

Key changes:
- Delete complete README.md file with 322 lines of documentation
- Remove installation guides for Gradle and Maven
- Remove usage examples and authentication documentation
- Remove advanced configuration examples for custom clients, retries, and timeouts

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