consider adding some more description of how to load files in the project work

[Isabellvse]

Many participant seem to be stuck on this initial step of downloading the file, so maybe we should include some more description in the project work e.g. they should seek inspiration from "nmr_omics.R" to download the files they need

`Download dataset --------------------------------------------------------

From DOI: 10.5281/zenodo.6597902
Direct URL: https://zenodo.org/record/6597902

Get both README and the Lipidomics dataset.
nmr_omics_dir <- here("data-raw/nmr-omics")
fs::dir_create(nmr_omics_dir)

download.file("https://zenodo.org/record/6597902/files/README.txt",
destfile = here(nmr_omics_dir, "README.txt")
)

download.file(
"https://zenodo.org/record/6597902/files/NMR_Integration_Data_Lipidomics.xlsx",
destfile = here(nmr_omics_dir, "lipidomics.xlsx"), mode = "wb"
)`