Add description of HCC workflow

[isc-etamarch]

Addresses #32

[isc-etamarch]

@isc-tleavitt Not sure if I got the merge request part of the HCC workflow correct.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.49%. Comparing base (94c92ab) to head (7519f0b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #543   +/-   ##
=======================================
  Coverage   25.49%   25.49%           
=======================================
  Files          18       18           
  Lines        2608     2608           
=======================================
  Hits          665      665           
  Misses       1943     1943           

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[isc-tleavitt]

A few initial points of feedback - this is all accurate for more of an expert mode / Git WebUI-based workflow, but not actually the starting point for the Health Connect Cloud workflow.

[isc-tleavitt]

Just going to merge these because they're an incremental improvement; we can keep iterating.