4: add blinded analysis model and corresponding sample function

[danielinteractive]

closes #4

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 95.14%. Comparing base (fe52f13) to head (a526a46).

Files	Patch %	Lines
src/blinded_analysis.jl	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   95.34%   95.14%   -0.21%     
==========================================
  Files           4        5       +1     
  Lines          86      103      +17     
==========================================
+ Hits           82       98      +16     
- Misses          4        5       +1     

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[brockk]

Had hoped to look at his today but day is slipping away. Will try by eob Mon

[brockk]

Beautiful Daniel. Excellent. Works nicely. Shame the codecov is complaining about src/blinded_analysis.jl#L42 which is simply "end". Our testing codecov is near-perfect.