feat: initial project setup

- Add .NET 8 backend with Clean Architecture
- Add React + Vite + TypeScript frontend
- Implement authentication with JWT
- Implement Azure Blob Storage client
- Implement OCR integration
- Implement supplier matching service
- Implement voucher generation
- Implement Fortnox provider
- Add unit and integration tests
- Add Docker Compose configuration

README.md

@@ -0,0 +1,78 @@
+# Invoice Master
+
+Multi-accounting system invoice processing platform supporting Fortnox, Visma, Hogia, and more.
+
+## Tech Stack
+
+- **Backend**: .NET 8 + ASP.NET Core + EF Core + PostgreSQL
+- **Frontend**: React 18 + TypeScript + Vite + TailwindCSS
+- **Infrastructure**: Docker + Azure
+
+## Quick Start
+
+### Prerequisites
+
+- .NET 8 SDK
+- Node.js 18+
+- Docker & Docker Compose
+
+### Development
+
+```bash
+# Clone the repository
+git clone <repo-url>
+cd invoice-master
+
+# Start infrastructure services
+docker-compose up -d postgres redis
+
+# Run backend
+cd backend
+dotnet restore
+dotnet run --project src/InvoiceMaster.API
+
+# Run frontend (in another terminal)
+cd frontend
+npm install
+npm run dev
+```
+
+### Docker Compose (Full Stack)
+
+```bash
+docker-compose up -d
+```
+
+Services:
+- Backend API: http://localhost:5000
+- Frontend: http://localhost:5173
+- Swagger UI: http://localhost:5000/swagger
+
+## Project Structure
+
+```
+├── backend/              # .NET Backend
+│   ├── src/
+│   │   ├── InvoiceMaster.API/           # Web API
+│   │   ├── InvoiceMaster.Core/          # Domain layer
+│   │   ├── InvoiceMaster.Application/   # Application layer
+│   │   ├── InvoiceMaster.Infrastructure/# Infrastructure layer
+│   │   └── InvoiceMaster.Integrations/  # Accounting providers
+│   └── tests/
+├── frontend/             # React Frontend
+│   └── src/
+├── docs/                 # Documentation
+└── docker-compose.yml    # Local development
+```
+
+## Documentation
+
+- [Architecture](ARCHITECTURE.md)
+- [API Design](API_DESIGN.md)
+- [Database Schema](DATABASE_SCHEMA.md)
+- [Development Plan](DEVELOPMENT_PLAN.md)
+- [Deployment Guide](DEPLOYMENT_GUIDE.md)
+
+## License
+
+MIT