docs: add DOI to CITATION

inst/CITATION

@@ -8,3 +8,19 @@ bibentry(bibtype="Article",
          year=2006,
          url="https://igraph.org")
 
+year <- sub("-.*", "", meta$Date)
+note <- sprintf("R package version %s", meta$Version)
+# https://github.com/cran/lidR/blob/f0dae39007c9d174f6e1962ff236fd8826f1501d/inst/CITATION#L21
+year <- format(Sys.Date(), "%Y")
+authors <- meta$`Authors@R`
+authors <- utils:::.read_authors_at_R_field(authors)
+authors <- Filter(function(e) {!(is.null(e$given) && is.null(e$family)) && !is.na(match("aut", e$role))}, authors)
+authors <- format(authors, include = c("given", "family"))
+authors <- paste(paste(head(authors, -1L), collapse = ", "), tail(authors, 1L), sep = " and ")
+bibentry(bibtype = "Manual",
+         title = "{igraph}: Network Analysis and Visualization in R",
+         author = authors,
+         year = year,
+         note = note,
+         doi = "10.5281/zenodo.7682609",
+	 url = "https://CRAN.R-project.org/package=igraph")