Add Hamiltonian proposal

[matt-graham]

Resolves #34

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e86f501) to head (420876d).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #45   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        11    +1     
  Lines          398       436   +38     
=========================================
+ Hits           398       436   +38     

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