Add recommended elements

Usage

use_recommended_tests(
  golem_wd = get_golem_wd(),
  spellcheck = TRUE,
  vignettes = TRUE,
  lang = "en-US",
  error = FALSE,
  pkg
)

golem_wd: Path to the root of the package. Default is get_golem_wd().
spellcheck: Whether or not to use a spellcheck test.
vignettes: Logical, TRUE to spell check all rmd and rnw files in the vignettes/ folder.
lang: Preferred spelling language. Usually either "en-US" or "en-GB".
error: Logical, indicating whether the unit test should fail if spelling errors are found. Defaults to FALSE, which does not error, but prints potential spelling errors
pkg: Deprecated, please use golem_wd instead

Used for side-effects.