add page on identifiers in dandi

[satra]

dandi uses several types of identifiers and users have to figure out what to do. many are not used to ontologies or identifiers. a page should describe the different types of identifiers, uris, and urls recommended for dandi.

from: dandi/helpdesk#49 (comment)

[satra]

@djarecka - i'm assigning this issue mostly as a learning exercise.

[melster1010]

I found this in a different DANDI doc repo, seems to match the requirements for this issue? should it also be added to the handbook? https://dandi.readthedocs.io/en/latest/ref/urls.html

[satra]

i think that is part of this. but there are several identifiers in the metadata record itself that's in dandi-schema and not on that page. let's keep this open for now.

[melster1010]

I'm happy to add the other identifiers or meet to discuss, thanks.