Solved problem 0001: Generate 200 activation codes

[gouriphadnis0301]

This pull request adds a complete solution for Problem 0001 from the "Show-Me-the-Code" Python exercises.

Key features of the solution:

1. Generates 200 unique activation codes, each 12 characters long.
2. Activation codes consist of uppercase letters (A-Z) and digits (0-9).
3. Ensures all codes are unique using a set.
4. Prints all codes to the console with numbering for easy reference.
5. Saves all codes to a text file named 'activation_codes.txt' for optional use.

This solution is self-contained, easy to read, and can be run directly. It demonstrates Python basics such as loops, random generation, string manipulation, and file I/O.

[Zzzzzyk]

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