convert this into an R package

[jpedataeditor]

convert this into a proper R package via https://usethis.r-lib.org/

Tasks

1. fork this repo
2. clone to your computer
3. use the current script as intended on your own computer. Try to run their test cases.
4. Make a note of all dependencies
5. create a new local branch pkg
6. create a package skeleton with https://usethis.r-lib.org/
7. fill in the stuff from their script. There should only be functions left when you are done, no script
8. convert their example tests into proper unit tests via https://testthat.r-lib.org/
9. run tests
10. commit
11. push branch pkg to your fork
12. from fork create a PR