update docs

[clarkliming]

close #46 (at least partially)

add minimal docs

[github-actions]

Code Coverage Summary

Filename                     Stmts    Miss  Cover    Missing
-------------------------  -------  ------  -------  --------------------
R/bias.R                        11       0  100.00%
R/predict_couterfactual.R       48       1  97.92%   55
R/prediction_cf.R                3       0  100.00%
R/robin_glm.R                   27       0  100.00%
R/treatment_effect.R            99       7  92.93%   30, 43, 64-68, 80
R/utils.R                       21       2  90.48%   17, 26
R/variance_anhecova.R           44      19  56.82%   28, 43-44, 57, 63-78
R/variance_hc.R                  9       0  100.00%
TOTAL                          262      29  88.93%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 0778b96

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results