1. Updated ToBe class diagram and created classes and interfaces basic structure
   - Created GameObject Abstract class
   - Created GameField Abstract class
   - Created IEngine Interface
   - Created IRenderer Interface
   - Created IDrawable Interface
   - Created BaseGameEngine class
   - Created BaseRenderer class
   - Created BaseGameField class
   - Created Mine class
   - Created EmptyField class
   - Created DestroyedField class

2. All usings removed from the created files. They will be added as needed inside the namespace as per convention.

3. Updated Issues and Milestones list in GitHub with concrete tasks.
Added IUserInterface interface
Added KeyboardInterface class