Initial project structure with CLI foundation

- Set up main CLI entry point with argparse architecture
- Implement complete tenant management system (CRUD operations)
- Add PostgreSQL database connection layer with configuration
- Create user management interface foundation
- Implement rich terminal UI with formatted tables
- Add interactive prompts with questionary library
- Include comprehensive project documentation
- Set up modular command structure with Parser/Command pattern

.gitignore

@@ -0,0 +1,24 @@
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+*.pyw
+*.pyz
+*.pywz
+*.pyzw
+*.pyzwz
+*.pyzwzw
+*.pyzwzwz
+*.pyzwzwzw
+*.pyzwzwzwz
+
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.env.development
+.env.test
+.env.production
+
+.venv/