Add Idolor Godswill ERC-6909 multi-token implementation for week-5 day-5

[big14way]

Comprehensive ERC-6909 multi-token standard implementation featuring:

• Support for both fungible and non-fungible tokens in single contract
• Per-token balances and allowance system
• Operator approvals for managing all tokens
• Safe transfers with comprehensive validation
• Batch operations and full event compliance

Task Submission PR

Student Info:

• Registered Name:
• Week: <week 5>
• Day: <day_5>

Task Details:

• Task Name: <task_title>
• Task Description: Briefly describe the task completed.

Checklist Before Submitting:

• My code follows the repository folder structure.
• I have properly named my files and folders.
• I have documented my code where necessary.
• I have tested my solution and ensured it works as expected.

Additional Comments:

If any, mention here.