Adding STM32F1-CubeMX port and a validating demo

[cmancon]

[codecov-io]

Codecov Report

Merging #12 into develop will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #12   +/-   ##
========================================
  Coverage    95.65%   95.65%           
========================================
  Files           13       13           
  Lines          598      598           
========================================
  Hits           572      572           
  Misses          26       26           

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