Add example using Boost.Math

[mborland]

Closes: #773

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.7%. Comparing base (d70e67f) to head (fd1f881).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #774     +/-   ##
=========================================
+ Coverage     98.7%   98.7%   +0.1%     
=========================================
  Files          223     223             
  Lines        16742   16742             
  Branches      1798    1798             
=========================================
+ Hits         16516   16518      +2     
+ Misses         226     224      -2     

see 1 file with indirect coverage changes

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