docs: adding command for single example build

[RobPasMue]

Description

Adding make command to test the generation of a single example.
Adding template for example as well

Closes #1892

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.38%. Comparing base (d3d6c77) to head (021f69c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1893   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files         105      105           
  Lines        9330     9330           
=======================================
  Hits         8433     8433           
  Misses        897      897           

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[MaxJPRey]

LGTM.

[RobPasMue]

Thank you both @PipKat and @MaxJPRey for your reviews. This is going to be super helpful for collaborators.