Train Reservation kata

The README provides guiding_test.py with expected interfaces, enabling a test-driven development approach from the start, as outlined in the guiding test section.

Includes mock booking reference and train data services via REST APIs, allowing practice with external dependencies, as detailed in the service integration instructions.

Focuses on implementing specific rules like 70% occupancy limits and seat grouping, providing a concrete scenario for logic development, as per the business rules section.

Supports both HTTP RESTful endpoints and command-line interfaces, accommodating different learning preferences, as mentioned in the command line option.