Adds taxonomic level of interest in the Recipe.
Examples
data(metaHIV_phy)
rec <- recipe(metaHIV_phy)
rec <- add_tax(rec, tax_info = "Species")
rec
#> ── DAR Recipe ──────────────────────────────────────────────────────────────────
#> Inputs:
#>
#> ℹ phyloseq object with 451 taxa and 156 samples
#> ✖ undefined variable of interest. Use add_var() to add it to Recipe!
#> ℹ taxonomic level Species
#>
#>
