docs: add changelog for version 1.0.0

Author: 7ttp

CHANGELOG.md

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+# Changelog
+
+All notable changes to the DeWatt project 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] - 2025-11-18
+
+### Added
+- Initial release of DeWatt platform
+- Blockchain-powered EV charging station finder
+- Solana integration for token rewards (EvT tokens)
+- MongoDB database for user and station management
+- Real-time charging station locator with interactive map
+- P2P marketplace for energy trading
+- User dashboard with charging history
+- Wallet integration with Solana wallets
+- Admin API for station management
+- Hall of Fame leaderboard system
+- Contact form with email notifications
+- Responsive design for mobile and desktop
+- TypeScript for type safety
+- Next.js 14 with App Router
+- Tailwind CSS for styling
+- Environment variable configuration
+- Security features and API authentication
+
+### Features
+- **Station Finder**: Locate nearby EV charging stations on interactive map
+- **Token Rewards**: Earn EvT tokens for every kWh charged
+- **P2P Trading**: Buy and sell energy credits directly
+- **Dashboard**: Track charging sessions, earnings, and statistics
+- **Leaderboard**: Hall of Fame for top contributors
+- **Privacy**: Arcium integration for private transactions
+- **Demo Mode**: Try platform features without wallet connection
+
+### Technical
+- Next.js 14.1.4 framework
+- TypeScript 5.0 with strict mode
+- MongoDB 6.20.0 database
+- Solana Web3.js 1.94.0
+- Tailwind CSS 3.4.3
+- pnpm 8.15.6 package manager
+- GitHub Actions CI/CD pipeline
+- ESLint and Prettier for code quality
+
+### Security
+- Environment variable based configuration
+- Admin API key authentication
+- Input validation and sanitization
+- Secure MongoDB connections
+- Rate limiting on API endpoints
+- CORS configuration
+
+### Documentation
+- Comprehensive README with setup instructions
+- API documentation
+- Environment variable templates
+- Contributing guidelines
+- MIT License
+
+## [Unreleased]
+
+### Planned
+- Mainnet deployment
+- Additional wallet providers
+- Advanced analytics dashboard
+- Mobile app (React Native)
+- Multi-language support
+- Enhanced security audits
+
+---
+
+## Version History
+
+- **1.0.0** - Initial public release (Cypherpunk Hackathon)