Add list of 3rd party software licences

[karniv00l]

Closes #301

[codecov]

Codecov Report

Merging #304 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #304   +/-   ##
=========================================
  Coverage     99.60%   99.60%           
  Complexity     1889     1889           
=========================================
  Files           291      291           
  Lines          5580     5580           
=========================================
  Hits           5558     5558           
  Misses           22       22           

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