First pass at adding techical docs

[TomHAnderson]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.70%. Comparing base (1f4d492) to head (3babb0a).
⚠️ Report is 3 commits behind head on 13.0.x.

Additional details and impacted files

@@             Coverage Diff              @@
##             13.0.x     #197      +/-   ##
============================================
- Coverage     99.70%   99.70%   -0.01%     
+ Complexity      447      412      -35     
============================================
  Files            57       57              
  Lines          1689     1685       -4     
============================================
- Hits           1684     1680       -4     
  Misses            5        5              

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