feat: Phase 0 - Infrastructure and scaffolding (T-001 to T-003)

This commit establishes the foundational infrastructure for the Aegis
MITRE ATT&CK Coverage Platform.

T-001: Initialize project and Docker Compose
- Set up Docker Compose with PostgreSQL 15, MinIO, and FastAPI backend
- Create basic FastAPI application with health endpoint
- Configure persistent volumes for data storage

T-002: Configuration and database connection
- Add centralized configuration using pydantic-settings
- Implement SQLAlchemy database connection with session management
- Configure MinIO and JWT settings

T-003: Initialize Alembic for migrations
- Set up Alembic with PostgreSQL connection from settings
- Create initial empty migration
- Configure autogenerate support for future models

Also includes:
- Professional README with setup instructions
- Comprehensive .gitignore for Python/Node/Docker
- Project task plan (AegisTestPlan.md)

README.md

@@ -0,0 +1,145 @@
+# Aegis - MITRE ATT&CK Coverage Platform
+
+Aegis is a comprehensive platform for tracking and managing security coverage against the MITRE ATT&CK framework. It enables security teams to document, validate, and visualize their defensive capabilities against known adversary techniques.
+
+## Features
+
+- **MITRE ATT&CK Integration**: Automatic synchronization with the MITRE ATT&CK framework via TAXII
+- **Coverage Tracking**: Track validation status for each technique (validated, partial, not covered, in progress)
+- **Test Management**: Document and manage security tests with full audit trail
+- **Evidence Storage**: Secure evidence file storage with SHA256 integrity verification
+- **Role-Based Access Control**: Granular permissions for red team, blue team, and leadership roles
+- **Intel Monitoring**: Automated scanning for new threat intelligence related to techniques
+- **Metrics Dashboard**: Real-time coverage metrics and reporting by tactic
+
+## Tech Stack
+
+- **Backend**: FastAPI (Python 3.11)
+- **Database**: PostgreSQL 15
+- **Object Storage**: MinIO (S3-compatible)
+- **ORM**: SQLAlchemy with Alembic migrations
+- **Frontend**: React + TypeScript + Vite (coming soon)
+
+## Quick Start
+
+### Prerequisites
+
+- Docker and Docker Compose
+- Git
+
+### Installation
+
+1. Clone the repository:
+```bash
+git clone <repository-url>
+cd Aegis
+```
+
+2. Start all services:
+```bash
+docker-compose up -d
+```
+
+3. Run database migrations:
+```bash
+docker exec -w /app aegis-backend-1 alembic upgrade head
+```
+
+4. Verify the installation:
+```bash
+# Check backend health
+curl http://localhost:8000/health
+# Expected: {"status":"ok"}
+```
+
+## Services
+
+| Service  | Port | Description |
+|----------|------|-------------|
+| Backend  | 8000 | FastAPI REST API |
+| PostgreSQL | 5433 | Database (mapped to 5433 to avoid conflicts) |
+| MinIO API | 9000 | S3-compatible object storage |
+| MinIO Console | 9001 | MinIO web interface |
+
+## API Documentation
+
+Once the backend is running, access the interactive API documentation at:
+
+- **Swagger UI**: http://localhost:8000/docs
+- **ReDoc**: http://localhost:8000/redoc
+
+## Project Structure
+
+```
+Aegis/
+├── docker-compose.yml      # Docker services configuration
+├── backend/
+│   ├── Dockerfile          # Backend container definition
+│   ├── requirements.txt    # Python dependencies
+│   ├── alembic.ini         # Alembic configuration
+│   ├── alembic/            # Database migrations
+│   │   ├── env.py
+│   │   ├── versions/       # Migration files
+│   │   └── ...
+│   └── app/
+│       ├── __init__.py
+│       ├── main.py         # FastAPI application entry point
+│       ├── config.py       # Application settings
+│       └── database.py     # SQLAlchemy configuration
+└── frontend/               # React frontend (coming soon)
+```
+
+## Configuration
+
+The application can be configured via environment variables:
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `DATABASE_URL` | `postgresql://postgres:postgres@postgres:5432/attackdb` | PostgreSQL connection string |
+| `SECRET_KEY` | `change-me-in-production` | JWT signing key |
+| `MINIO_ENDPOINT` | `minio:9000` | MinIO server endpoint |
+| `MINIO_ACCESS_KEY` | `minioadmin` | MinIO access key |
+| `MINIO_SECRET_KEY` | `minioadmin` | MinIO secret key |
+| `MINIO_BUCKET` | `evidence` | Bucket for evidence files |
+
+## Development
+
+### Running Migrations
+
+```bash
+# Generate a new migration after model changes
+docker exec -w /app aegis-backend-1 alembic revision --autogenerate -m "description"
+
+# Apply migrations
+docker exec -w /app aegis-backend-1 alembic upgrade head
+
+# Rollback one migration
+docker exec -w /app aegis-backend-1 alembic downgrade -1
+
+# Check current migration
+docker exec -w /app aegis-backend-1 alembic current
+```
+
+### Accessing Services
+
+- **MinIO Console**: http://localhost:9001 (login: `minioadmin` / `minioadmin`)
+- **PostgreSQL**: `psql -h localhost -p 5433 -U postgres -d attackdb`
+
+## User Roles
+
+| Role | Description |
+|------|-------------|
+| `admin` | Full system access |
+| `red_tech` | Red team technician - can create and edit tests |
+| `blue_tech` | Blue team technician - can create and edit tests |
+| `red_lead` | Red team lead - can validate tests |
+| `blue_lead` | Blue team lead - can validate tests |
+| `viewer` | Read-only access |
+
+## License
+
+This project is proprietary software. All rights reserved.
+
+## Contributing
+
+Please read the contribution guidelines before submitting pull requests.