Test task, small solution based on so-called code kata.

Terms of the assignment 

Use C# 7.0 (or later) to build the program that complies to the following Definition of Done:  
    User story Acceptance criteria fulfilled; 

    Test should be done; 

    The solution is deployable; 

    Documentation is created or updated. 

The resulting code must be in production-ready state and must fulfil the acceptance criteria  outlined below. 

Related materials should be submitted to representatives as a link to a public repository at github.com. 

    Acceptance criteria: 

      1. It’s required to implement linked list that has the following basic interface:

        1.1 The list consists of nodes. Each node has a string value, along with whatever housekeeping the list itself needs. 

        1.2 New nodes are added to the end of the list. 

        1.3 You can ask the list if it contains a given string. If it does, it returns the node  containing that string. 

        1.4 You can delete a node from the list. 

        1.5 You can ask the list to return an array of all its values. 

      2. Create two implementations of the list: 

        2.1 A singly linked list (each node has a reference to the next node). 

         2.2 A doubly linked list (each node has a reference to both the next and previous  

     3. Obviously, don’t use predefined library classes as list implementations.