added theory of csep tests to documentation

[wsavran]

updates to documentation for theory of tests

[codecov-commenter]

Codecov Report

Merging #171 (85e6f8d) into master (f48b110) will not change coverage.
The diff coverage is n/a.

❗ Current head 85e6f8d differs from pull request most recent head 2aba315. Consider uploading reports for the commit 2aba315 to get more accurate results

@@           Coverage Diff           @@
##           master     #171   +/-   ##
=======================================
  Coverage   56.09%   56.09%           
=======================================
  Files          20       20           
  Lines        3264     3264           
  Branches      519      519           
=======================================
  Hits         1831     1831           
  Misses       1314     1314           
  Partials      119      119           

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