Add main function
Update git ignore
Add test for invalid input
Passing test for invalid input
Add test for complex number
Passing test for complex number, add test for LcdNumberTemplate and implementation that pass it
Add test for concatenating templates
Passing test for concatenating templates
Refactoring - LcdNumbers now return templates
Refactoring - remove returning constant in LcdNumberGenerator
Passing test for empty string in LcdNumbersGenerator
Refactring - change classes name and make methods shorter