evolution-data-server: more docs

hosts/common/programs/evolution-data-server.nix

@@ -31,6 +31,8 @@
 # - `libexec/evolution-data-server/addressbook-export` can (supposedly) export an address book to vcard or csv format
 # - `src/examples/cursor/cursor-example` (not installed) when run will import a directory of .vcf cards into a `local` addressbook (creating the addressbook if it doesn't exist)
 # - `evolution /path/to/vcard.vcf` imports a vcf into the primary e-d-s addressbook, but requires UI interaction
+# - `gnome-contacts-parser vcard /my/vcard.vcf` from ${gnome-contacts}/libexec/gnome-contacts: transforms a vcard into a gvariant
+#     that's used internally; there doesn't appear a way to plumb that gvariant down into the database without going through the UI
 #
 # noteworthy build-time config options:
 # - ENABLA_VALA_BINDINGS