docs: add valid sudoku count and clarify project focus on hardest puzzles in readme

The readme now includes the exact number of valid Sudoku puzzles (6.67 × 10²¹) and explicitly states the project's focus on generating and solving the hardest possible sudokus, replacing the vague reference to backtracking algorithms.
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retoor 2025-01-10 22:42:10 +00:00
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This project is just a collection of research regarding the generation of sudoku's.
It's not a production project.
The main focus is on the generation of sudoku's using several algorithms like backtracking.
The number of valid Sudoku puzzles has been calculated to be 6,670,903,752,021,072,936,960 (approximately 6.67 × 10²¹).
The main focus of this project is to generate and solve the hardest possible sudoku's.
## Applications