Add main project README with overview and quick start guide

README.md

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+# Debian Atomic Desktop Project
+
+A project to create a Debian-based atomic desktop system using `bootc` and `OSTree`, inspired by `ublue-os`.
+
+## Project Structure
+
+This project is organized into phases:
+
+### Phase 1: `01-debian-atomic/`
+- **Goal**: Create a minimal, bootable Debian Trixie atomic image
+- **Status**: ✅ Complete
+- **Contents**: 
+  - `Containerfile` - Defines the base atomic image
+  - `justfile` - Build automation
+  - `README.md` - Phase 1 documentation
+
+### Phase 2: `02-installer/`
+- **Goal**: Create a bootable ISO with Calamares installer
+- **Status**: 🔄 In Progress (Contents file issues being resolved)
+- **Contents**:
+  - `justfile` - Live-build automation
+  - `calamares/` - Installer configuration
+  - `config/` - Live-build configuration
+  - `scripts/` - Helper scripts
+
+### Phase 2 Alternative: `02-installer-bootc/`
+- **Goal**: Alternative approach using container-based VM testing
+- **Status**: 🔄 In Progress
+- **Contents**:
+  - `Containerfile` - VM container definition
+  - `justfile` - Container build automation
+  - `scripts/` - Testing scripts
+
+## Quick Start
+
+1. **Phase 1** (Atomic Image):
+   ```bash
+   cd 01-debian-atomic
+   just build-image
+   just test-image
+   ```
+
+2. **Phase 2** (Installer ISO):
+   ```bash
+   cd 02-installer
+   just build-iso
+   ```
+
+3. **Phase 2 Alternative** (Container VM):
+   ```bash
+   cd 02-installer-bootc
+   just build-container
+   just test-container
+   ```
+
+## Prerequisites
+
+- `just` command runner
+- `podman` or `docker`
+- `live-build` (for Phase 2)
+- `qemu-system-x86_64` (for testing)
+
+## Development
+
+See `roadmap.md` for detailed project planning and `todo` for current tasks.
+
+## License
+
+This project is open source. See individual files for specific licensing information.