This commit introduces the initial ESPHome configuration for the irrigation system.
- `irrigation_system.yaml`: ESPHome configuration with Modbus valve control.
- `create_secrets.py`: Script to generate `secrets.yaml`.
- `secrets.yaml.example`: Example secrets file.
- `requirements.txt`: Python dependencies.
- `.gitignore`: Standard ESPHome gitignore file.
Signed-off-by: Eduard Iten <eduard@iten.pro>