docs: Add changelog for initial release v0.1.0

Author: Nisarg38

CHANGELOG.md

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+# Changelog
+
+## [0.1.0] - 2024-01-19
+
+### Added
+- Initial release of Promptix Library
+- Core functionality:
+  - Prompt management with versioning support
+  - Streamlit-based Studio UI for prompt management
+  - JSON-based storage system for prompts
+  - Support for multiple prompt versions with live/draft states
+
+### Features
+- **Promptix Studio**:
+  - Interactive dashboard with prompt statistics
+  - Prompt library with search functionality
+  - Version management for each prompt
+  - Playground for testing prompts
+  - Modern, responsive UI with Streamlit
+
+- **Core Library**:
+  - Simple API for prompt management
+  - Version control for prompts
+  - Support for system messages and variables
+  - Easy integration with existing projects
+
+### Dependencies
+- Python >=3.8
+- Streamlit >=1.29.0
+- Python-dotenv >=1.0.0
+
+### Documentation
+- Basic usage examples in `examples/` directory
+- README with installation and getting started guide