Add an Examples section on the Cadence Testing Framework doc

[m-Peter]

Description

Linked the https://github.com/Build-Squad/flow-code-coverage repository, on this new section. It contains many useful examples on how to utilize the Cadence Testing Framework, and also the code coverage feature.

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[m-Peter]

cc @alxflw (Saw that you were the last one to edit this document 😅 )

[codecov]

Codecov Report

Merging #2493 (7a5e046) into master (d47ff5d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2493   +/-   ##
=======================================
  Coverage   78.35%   78.35%           
=======================================
  Files         327      327           
  Lines       73039    73039           
=======================================
  Hits        57230    57230           
  Misses      13710    13710           
  Partials     2099     2099           

Flag	Coverage Δ
unittests	78.35% <ø> (ø)

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