Design notes and doc edits

[alecloudenback]

No description provided.

[codecov]

Codecov Report

Merging #104 (d3b7792) into master (61bcc9a) will increase coverage by 57.64%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #104       +/-   ##
===========================================
+ Coverage   32.40%   90.05%   +57.64%     
===========================================
  Files           8        9        +1     
  Lines         324      362       +38     
===========================================
+ Hits          105      326      +221     
+ Misses        219       36      -183     

Impacted Files	Coverage Δ
src/death_distribution.jl	100.00% <0.00%> (ø)
src/CSV.jl	97.72% <0.00%> (+0.16%)	⬆️
src/XTbML.jl	65.11% <0.00%> (+0.91%)	⬆️
src/MortalityTable.jl	98.18% <0.00%> (+81.81%)	⬆️
src/life_expectancy.jl	90.90% <0.00%> (+90.90%)	⬆️
src/parameterized_models.jl	98.05% <0.00%> (+98.05%)	⬆️
src/get_SOA_table.jl	100.00% <0.00%> (+100.00%)	⬆️

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