Add support for a single file, add unit-tests and add azure pipelines yaml

[StefH]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0a00205). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #2   +/-   ##
=========================================
  Coverage          ?   95.41%           
=========================================
  Files             ?        2           
  Lines             ?      786           
  Branches          ?       15           
=========================================
  Hits              ?      750           
  Misses            ?       29           
  Partials          ?        7           

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