Data structure/doubly linked list

[justemoilouise]

Description

• add implementation for doubly linked list
• add unit tests

[codecov-commenter]

Codecov Report

Merging #133 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage   99.66%   99.70%   +0.03%     
==========================================
  Files          39       40       +1     
  Lines         602      670      +68     
  Branches       88      106      +18     
==========================================
+ Hits          600      668      +68     
  Misses          2        2              

Impacted Files	Coverage Δ
src/dataStructures/doublyLinkedList.js	100.00% <100.00%> (ø)

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