add ci tests

[bvenn]

Thank you for contributing to FSharp.Stats. Please take the time to tell us a bit more about your PR.

Please reference the issue(s) this PR is related to

Fixes #247

Please list the changes introduced in this PR

• changed // to /// for correct documentation
• added unit tests for confidence interval

[Required] please make sure you checked that

• [x] The project builds without problems on your machine

[Optional]

• [x] Added unit tests regarding the added features

[codecov-commenter]

Codecov Report

Merging #248 (12b9138) into developer (4780203) will increase coverage by 0.25%. The diff coverage is 94.73%.

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@@              Coverage Diff              @@
##           developer     #248      +/-   ##
=============================================
+ Coverage      44.72%   44.97%   +0.25%     
=============================================
  Files            147      148       +1     
  Lines          14452    14471      +19     
  Branches        1923     1923              
=============================================
+ Hits            6464     6509      +45     
+ Misses          7466     7432      -34     
- Partials         522      530       +8     

Impacted Files	Coverage Δ
src/FSharp.Stats/ConfidenceInterval.fs	100.00% <ø> (+100.00%)	:arrow_up:
tests/FSharp.Stats.Tests/Main.fs	0.00% <0.00%> (ø)
tests/FSharp.Stats.Tests/ConfidenceInterval.fs	100.00% <100.00%> (ø)
.../FSharp.Stats/Distributions/Continuous/StudentT.fs	19.44% <0.00%> (+5.55%)	:arrow_up:
src/FSharp.Stats/Distributions/Continuous.fs	54.54% <0.00%> (+31.81%)	:arrow_up:
src/FSharp.Stats/Optimization/Bisection.fs	47.61% <0.00%> (+47.61%)	:arrow_up:

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