Create custom Dictionary class

[romaneo]

Using the technique we talked about on the last call create a custom implementation of the Dictionary structure.

Programm requirements:

• implement the ability to add new pair of Key```Value``` (myDictionary.Add("someKey", "someValue"))
• implement retriving value by Key (myDictionary.Get("someKey"))
• impement validation if key already present in the dictionary (myDictionary.IsExist("someKey"))
• implement the ability to remove existing pair by Key (myDictionary.Remove("someKey"))

Programm recommendation:

• you can implement internal dictionary storage as List(preferred and easier) or Array

Learning materials:

• https://metanit.com/sharp/tutorial/3.12.php
• https://metanit.com/sharp/tutorial/3.38.php
• https://docs.microsoft.com/ru-ru/dotnet/csharp/programming-guide/generics/constraints-on-type-parameters
• https://metanit.com/sharp/tutorial/2.31.php (may be useful for the situation when the specified key was not found)
• https://stackoverflow.com/questions/2357410/having-to-implement-a-generic-less-than-and-greater-than-operation/2357426 (I think this link is not necessary for the current task but for general knowledge or may be used as an explanation to the demo program )

Hint spoiler

You can implement both ```dictionary``` and ```pair``` as separate classes
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CODE SPOILER HINT (OPEN IN CASE OF CRITICAL NEED)

https://pastebin.com/1LrBN6rc

[marikalmuk]

https://metanit.com/sharp/tutorial/3.36.php - Operators override https://app.pluralsight.com/library/courses/csharp-equality-comparisons/table-of-contents

[romaneo]

Please rename Class1 and Class2 according to the class names inside. After that, merge the branch and close the issue.