Implement project Essential_L8.1

@kostiantyn-kuzin please review
I don't like this. You need to parse the user input better. Let's try the following: user inputs color as a string, for ex: "red", "RED", "Red" etc. Use the following technique to correctly parse it: http://msdn.microsoft.com/en-us/library/dd783499%28v=vs.110%29.aspx