Added Viz folder for visual callgraphs of each example

[copyleftdev]

I created some callgraphs, figured it may help some visual leaners.

[codecov-io]

Codecov Report

Merging #195 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #195   +/-   ##
=======================================
  Coverage   94.73%   94.73%           
=======================================
  Files          61       61           
  Lines        2430     2430           
=======================================
  Hits         2302     2302           
  Misses        128      128

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