Moved Config class from main.cpp to a separate file.

Signed-off-by: Vinicius Dias de Oliveira Gardelli <gardelli123@gmail.com>
Renamed structure Coordinate to CartesianCoordinate.
Renamed method PatternSearch to TemplateMatch.
Created method FourierTransform.
Created operator() for CartesianCoordinate parameters.
Created method SubImage().
Added smallMask.pgm to version control.
Created TODO file to keep track of TODO tasks.

Signed-off-by: Vinicius Dias de Oliveira Gardelli <gardelli123@gmail.com>