Add kruskal algorithm description

[AlfredCP]

• resolves Add Kruskal Algorithm Description in README #130
• Added short description of the algorithm with links to more extended explanations sources

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Codecov Report

Merging #131 (1120afd) into master (b0f661c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #131   +/-   ##
=======================================
  Coverage   96.90%   96.90%           
=======================================
  Files          39       39           
  Lines        4423     4423           
=======================================
  Hits         4286     4286           
  Misses        137      137           

Flag	Coverage Δ
unittests	96.90% <ø> (ø)

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