Added IFileStorage interface to Main class diagram

Added IFileStorage interface to Main class diagram
Revert "Added IFileStorage interface to Main class diagram"

This reverts commit a198d742aea80e700a1e657b70bffadc6e554163.
added gitignore file
Merge pull request #49 from olga-jane/master

Update branch K_Protsenko
Added IFileStorage interface to Main class diagram

Added IFileStorage interface to Main class diagram
Merge pull request #50 from olga-jane/K_Protsenko

K protsenko