Add example for challenging SCF convergence

[marvinfriede]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.72%. Comparing base (9c4af05) to head (44053a7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #173   +/-   ##
=======================================
  Coverage   82.72%   82.72%           
=======================================
  Files         195      195           
  Lines        9717     9717           
  Branches     1473     1473           
=======================================
  Hits         8038     8038           
  Misses       1328     1328           
  Partials      351      351           

Flag	Coverage Δ
	82.72% <ø> (?)

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[hoelzerC]

lgtm