Organize the data structure files in appropriate directories

[NageshAndani]

Please include a summary of the change. Please also include relevant motivation and context (if applicable).

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added comments to hard-to-understand areas of my code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have made corresponding changes to the comments
• I have made corresponding changes to the README.md

[codecov]

Codecov Report

Merging #204 (1564c34) into master (db64ed7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #204   +/-   ##
=======================================
  Coverage   92.70%   92.70%           
=======================================
  Files         102      102           
  Lines        4510     4510           
=======================================
  Hits         4181     4181           
  Misses        329      329           

Impacted Files	Coverage Δ
...es/LinkedList/DoublyLinkedList/DoublyLinkedList.cs	81.39% <ø> (ø)
...inkedList/DoublyLinkedList/DoublyLinkedListNode.cs	100.00% <ø> (ø)
...es/LinkedList/SinglyLinkedList/SinglyLinkedList.cs	98.73% <ø> (ø)
...inkedList/SinglyLinkedList/SinglyLinkedListNode.cs	100.00% <ø> (ø)
DataStructures/Queue/ArrayBasedQueue.cs	100.00% <ø> (ø)
DataStructures/Queue/ListBasedQueue.cs	100.00% <ø> (ø)
DataStructures/Queue/StackBasedQueue.cs	100.00% <ø> (ø)
DataStructures/Stack/ArrayBasedStack.cs	97.72% <ø> (ø)
DataStructures/Stack/ListBasedStack.cs	94.73% <ø> (ø)

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[siriak]

Could you also update the links in README.md?

[NageshAndani]

Could you also update the links in README.md?

Updated

[siriak]

Looks good, thanks!