The class Engine.cs is deleted
Merge branch 'master' of https://github.com/TeamSilver/Minesweeper
Created an enumeration -> CommandType.cs

Created new class -> ExecuteCommand.cs
Added a new methods and fields in Command.cs file
Changed the logic of Main method in Minesweeper.cs file
Merge branch 'master' of https://github.com/TeamSilver/Minesweeper