Working board reader, initial types, print the board to console
Solves simple boards with Hidden Single rule
Start working on adding more strategies/search
General solver using Naked Singles + DFS
Refactor to extract the Board into its own module, and make it reexport any necessary Types.
After gaining some understanding of the problem, create a test suite. Using the sudokus from Project Euler
Add support for CSV files as input and output (requested in email)