#920: add reader support for file input

[StephanStrehlerCGI]

Description

Reference

Issues: #920

Screenshots (If UI changed)

Check-List

• All Acceptance criteria of user story are met
• Accessibility was considered and tested (On UI Change)
• Internal Review is maintained
• Documentations external and internal are completed
• Smoketest successful (Manual E2E-Test depending on Change)
• No waste on Branch left (e.g. console.logs)
• Board is up-to-date

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.62%. Comparing base (eb03b78) to head (f6c57ba).

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #1520   +/-   ##
=========================================
  Coverage     43.62%   43.62%           
  Complexity     1658     1658           
=========================================
  Files           648      648           
  Lines          9593     9593           
  Branches        469      469           
=========================================
  Hits           4185     4185           
  Misses         5237     5237           
  Partials        171      171           

Flag	Coverage Δ
unittests	43.62% <ø> (ø)

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