Implement project Essential_L16.3 (Overloadable Operators)
Add and implement class Date.cs.
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Merge pull request #48 from anna-kulyk/16.03

Implement project Essential_L16.3 (Overloadable Operators)
Implement project Essential_L16.2 (ICloneable)
Add and implement class House.cs. Override method Clone and implement method DeepClone.
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Conflicts:
	.gitignore
	Essential/Essential_L16/Essential_L16.sln
Improve methods Clone and DeepClone.
Update gitignor