docs: add CHANGELOG.md for version history

Author: DevanshuNEU

CHANGELOG.md

@@ -0,0 +1,52 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Frontend v2 redesign (in progress)
+- Anonymous repo indexing flow
+- AI-powered search summaries
+
+### Changed
+- Premium dark theme with glassmorphism effects
+- Improved search result display
+
+---
+
+## [0.1.0] - 2024-12-23
+
+### Added
+- Semantic code search using vector embeddings
+- Dependency graph analysis
+- Impact analysis for code changes
+- Code style analysis
+- MCP (Model Context Protocol) server integration
+- Support for Python, TypeScript, JavaScript, Go, Rust
+- Supabase authentication
+- Redis caching layer
+- Docker deployment support
+- Comprehensive API documentation
+
+### Infrastructure
+- FastAPI backend with async support
+- React + Vite + TypeScript frontend
+- Pinecone vector database integration
+- GitHub OAuth integration
+- Rate limiting and security middleware
+
+---
+
+## Version History
+
+This project follows [Semantic Versioning](https://semver.org/):
+
+- **MAJOR** version for incompatible API changes
+- **MINOR** version for new functionality (backwards compatible)
+- **PATCH** version for bug fixes (backwards compatible)
+
+Pre-1.0 releases (0.x.x) may have breaking changes in minor versions as the API stabilizes.