Example with openID credentials

[gagoar]

Description

In the examples we offer, there is not a single mention of OpenID Credentials. This PR offers an example stolen from #248 thanks @thenanor for your help!

this should close #248

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (d09d3b1) to head (cfb0c7c). Report is 71 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #252   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           44        51    +7     
  Branches         4         9    +5     
=========================================
+ Hits            44        51    +7     

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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