Add Project Runeberg author+edition identifiers

Project Runeberg is similar to Project Gutenberg, but focuses on Nordic
and Scandinavian authors and literature.

These identifiers basically correspond to
https://www.wikidata.org/wiki/Property:P3154 and
https://www.wikidata.org/wiki/Property:P3155
in Wikidata.

Closes internetarchive#9981

openlibrary/plugins/openlibrary/config/author/identifiers.yml

@@ -50,6 +50,11 @@ identifiers:
     notes: Should be a number
     url: https://www.gutenberg.org/ebooks/author/@@@
     website: https://www.gutenberg.org
+-   label: Project Runeberg
+    name: project_runeberg
+    notes: Should be a string of alphanumeric characters (/[0-9a-z/.-]+/)
+    url: https://runeberg.org/authors/@@@.html
+    website: https://runeberg.org/
 -   label: SBN/ICCU (National Library Service of Italy)
     name: opac_sbn
     notes: format is /^\D{2}[A-Z0-3]V\d{6}$/

openlibrary/plugins/openlibrary/config/edition/identifiers.yml

@@ -241,6 +241,11 @@ identifiers:
     name: project_gutenberg
     url: https://www.gutenberg.org/ebooks/@@@
     website: https://www.gutenberg.org
+-   label: Project Runeberg
+    name: project_runeberg
+    notes: Should be a string of alphanumeric characters (/[0-9a-z/.-]+/)
+    url: https://runeberg.org/@@@/
+    website: https://runeberg.org/
 -   label: Scribd
     name: scribd
     url: https://www.scribd.com/doc/@@@/