Initial commit of Unity SDK for GumYum NPC client

CHANGELOG.md

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+# Changelog
+
+All notable changes to the GumYum NPC SDK for Unity will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2024-01-15
+
+### Added
+- Initial release of GumYum NPC SDK for Unity
+- API key authentication support
+- Deterministic NPC spawning with universe and seed parameters
+- Filtered NPC spawning based on profession, location, personality type, and sex
+- OpenAI-compatible chat completions API
+- Real-time streaming chat responses
+- Dynamic mood system with transitions
+- Stress level tracking
+- Conversation history management
+- Unity coroutine integration
+- Async/await support for modern C# workflows
+- GumYumUnityClient singleton for easy scene integration
+- Custom Editor window for API settings
+- Example scenes demonstrating basic and advanced features
+- Comprehensive documentation
+
+### Dependencies
+- Unity 2021.3 or higher
+- Newtonsoft JSON Unity Package (com.unity.nuget.newtonsoft-json) 3.2.1
+
+## [0.9.0-beta] - 2024-01-01
+
+### Added
+- Beta release for testing
+- Core API functionality
+- Basic NPC spawning and chat
+
+### Known Issues
+- Streaming responses may have occasional connection drops
+- Mood transitions require fine-tuning
+
+## [0.1.0-alpha] - 2023-12-15
+
+### Added
+- Alpha release
+- Initial API integration
+- Basic spawning functionality