Flesh out ongoing development documentation

[mmore500]

• add code of conduct
• add roadmap
• add project objectives
• add governance info
• other minor improvements and additions

[codecov-commenter]

Codecov Report

Merging #175 (a48ff47) into main (47bc72b) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #175   +/-   ##
=======================================
  Coverage   61.42%   61.42%           
=======================================
  Files         105      105           
  Lines       18646    18646           
=======================================
  Hits        11453    11453           
  Misses       7193     7193           

Flag	Coverage Δ
unittests	61.42% <ø> (ø)

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