update readme, adding license

[shajoezhu]

What changes are proposed in this pull request?

• Style this entry in a way that can be copied directly into NEWS.md. (#, @)

Provide more detail here as needed.

Reference GitHub issue associated with pull request. e.g., 'closes #'

---

Pre-review Checklist (if item does not apply, mark is as complete)

• All GitHub Action workflows pass with a ✅
• PR branch has pulled the most recent updates from master branch: usethis::pr_merge_main()
• If a bug was fixed, a unit test was added.
• Code coverage is suitable for any new functions/features (generally, 100% coverage for new code): devtools::test_coverage()
• Request a reviewer

Reviewer Checklist (if item does not apply, mark is as complete)

• If a bug was fixed, a unit test was added.
• Run pkgdown::build_site(). Check the R console for errors, and review the rendered website.
• Code coverage is suitable for any new functions/features: devtools::test_coverage()

When the branch is ready to be merged:

• Update NEWS.md with the changes from this pull request under the heading "# cards (development version)". If there is an issue associated with the pull request, reference it in parentheses at the end update (see NEWS.md for examples).
• All GitHub Action workflows pass with a ✅
• Approve Pull Request
• Merge the PR. Please use "Squash and merge" or "Rebase and merge".

[github-actions]

✅ All contributors have signed the CLA
_{Posted by the CLA Assistant Lite bot.}

[shajoezhu]

I have read the CLA Document and I hereby sign the CLA

[github-actions]

Unit Tests Summary

  1 files   68 suites   1m 27s ⏱️
 68 tests  68 ✅ 0 💤 0 ❌
166 runs  166 ✅ 0 💤 0 ❌

Results for commit e91cffa.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Performance Difference

Test Suite	$Status$	Time on main	$±Time$	$±Tests$	$±Skipped$	$±Failures$	$±Errors$
tbl_hierarchical_rate_and_count	💀	$0.00$	$-0.00$	$-2$	$0$	$0$	$0$
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	$-4$	$0$	$0$	$0$

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
modify_header_rm_md	👶		$+0.08$	unnamed
tbl_baseline_chg	💚	$14.08$	$-9.07$	tbl_baseline_chg_works
tbl_hierarchical_rate_and_count	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_and_count_digits_styling_defaults_to_gtsummary
tbl_hierarchical_rate_and_count	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_and_count_sort_
tbl_hierarchical_rate_and_count	💀	$18.80$	$-18.80$	tbl_hierarchical_rate_and_count_works
tbl_hierarchical_rate_and_count	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_and_count_works_only_with_2_or_3_variables
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_error_messaging_works
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_filter_works
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_grade_groups_works_with_some_grades_not_in_groups
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_grades_exclude_works
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_include_overall_works
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_keep_zero_rows_works
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_sort_works
tbl_hierarchical_rate_by_grade	💀	$6.04$	$-6.04$	tbl_hierarchical_rate_by_grade_works
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_works_with_add_overall_
tbl_hierarchical_rate_by_grade	💀	$0.00$	$-0.00$	tbl_hierarchical_rate_by_grade_works_with_non_factor_grade_variables
tbl_survfit_quantiles	💚	$6.09$	$-4.98$	tbl_survfit_quantiles_works
theme_gtsummary_roche	💚	$3.39$	$-3.31$	theme_gtsummary_roche_works

Results for commit 6934e18

♻️ This comment has been updated with latest results.

[github-actions]

Code Coverage Summary

Filename                               Stmts    Miss  Cover    Missing
-----------------------------------  -------  ------  -------  ---------
R/add_blank_rows.R                        63       0  100.00%
R/add_hierarchical_count_row.R            33       0  100.00%
R/crane-package.R                          2       2  0.00%    17-18
R/deprecated.R                             6       6  0.00%    15-21
R/label_roche.R                           72       0  100.00%
R/modify_header_rm_md.R                   18       2  88.89%   35-36
R/modify_zero_recode.R                    13       0  100.00%
R/tbl_baseline_chg.R                     186       0  100.00%
R/tbl_hierarchical_rate_and_count.R      148       0  100.00%
R/tbl_hierarchical_rate_by_grade.R       271       3  98.89%   162-164
R/tbl_listing.R                           35       0  100.00%
R/tbl_null_report.R                        9       0  100.00%
R/tbl_roche_summary.R                     64       0  100.00%
R/tbl_shift.R                            116       0  100.00%
R/tbl_survfit_quantiles.R                132       1  99.24%   295
R/tbl_survfit_times.R                     92       0  100.00%
R/theme_gtsummary_roche.R                 74       0  100.00%
R/utils.R                                 36       0  100.00%
TOTAL                                   1370      14  98.98%

Diff against main

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

Results for commit: e91cffa

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results