add glossa_article()

[stefanocoretta]

The pull request adds glossa_article() for articles of Glossa: a journal of general linguistics (Glossa).

✅ R CMD check succeeded.

✅ Pull request check list:

• [x] Unless you have done it in any other RStudio's projects before, please sign the individual or corporate contributor agreement for a significant pull request (it is fine not to sign it if a PR is only intended to fix a few typos). You can send the signed copy to jj@rstudio.com.

• [x] Add the journalname_article() function to R/article.R if the output format is simple enough, otherwise create a separate R/journalname_article.R.

• [x] Add the Pandoc LaTeX template inst/rmarkdown/templates/journalname/resources/template.tex.

• [x] Add a skeleton article inst/rmarkdown/templates/journalname/skeleton/skeleton.Rmd.

• [x] Add a description of the template inst/rmarkdown/templates/journalname/template.yaml.

• [x] Please include the document class file (*.cls) if needed, but please do not include standard LaTeX packages (*.sty) that can be downloaded from CTAN. If you are using TinyTeX or TeX Live, you can verify if a package is available on CTAN via tinytex::parse_packages(files = "FILENAME"") (e.g., when FILENAME is plain.bst, it should return "bibtex", which means this file is from a standard CTAN package). Please keep the number of new files absolutely minimal (e.g., do not include PDF output files), and also make examples minimal (e.g., if you need a .bib example, try to only leave one or two bibliography entries in it, and don't include too many items in it without using all of them).

• [x] Update Rd and namespace (could be done by devtools::document()).

• [x] Update NEWS.

• [x] Update README with a link to the newly supported journal. Please add your Github username and the full name of the journal (follow other examples in the list).

• [x] Add a test to tests/testit/test-formats.R by adding a line test_format("journalname"). We try to keep them in alphabetical order.

• [x] Add your name to the list of authors Authors@R in DESCRIPTION. You don't need to bump the package version in DESCRIPTION.

[stefanocoretta]

@cderv macOS check fails with tlmgr not found.

[stefanocoretta]

I think I implemented all the fixes and changes. Let me know if there's anything else! Thanks for the patience.