Add initial doc for journal lists (#12406)

Co-authored-by: Ruslan <[email protected]>

docs/code-howtos/journal-abbreviations.md

@@ -0,0 +1,27 @@
+# Journal Abbreviations
+
+## Preparation
+
+- Ensure that `buildres/abbrv.jabref.org` contains data. Otherwise, the submodules were not configured correctly.
+- Ensure that `build/resources/main/journals/journal-list.mv` exists. It is generated by gradle task `generateJournalListMV`, which uses `org.jabref.cli.JournalListMvGenerator`.
+
+## Where does the data come from?
+
+The generator uses all `.csv` files from <https://github.com/JabRef/abbrv.jabref.org/tree/main/journals>, but ignores following ones:
+
+```java
+        Set<String> ignoredNames = Set.of(
+                // remove all lists without dot in them:
+                // we use abbreviation lists containing dots in them only (to be consistent)
+                "journal_abbreviations_entrez.csv",
+                "journal_abbreviations_medicus.csv",
+                "journal_abbreviations_webofscience-dotless.csv",
+
+                // we currently do not have good support for BibTeX strings
+                "journal_abbreviations_ieee_strings.csv"
+        );
+```
+
+## Future work
+
+See <https://github.com/JabRef/jabref-issue-melting-pot/issues/41>