feat: linked-list add length property

[hifizz]

No description provided.

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #8   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         160    173   +13     
  Branches       25     25           
=====================================
+ Hits          160    173   +13

Impacted Files	Coverage Δ
src/linked-list/index.ts	100% <100%> (ø)	⬆️

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