DOC: add docstring

src/caoscrawler/identifiable_adapters.py

@@ -166,6 +166,14 @@ class IdentifiableAdapter(metaclass=ABCMeta):
         """
         retrieve the registred identifiable and fill the property values to create an
         identifiable
+
+        Args:
+            record: the record for which the Identifiable shall be created.
+            referencing_entities: a dictionary (Type: dict[int, dict[str, list[db.Entity]]]), that
+              allows to look up entities with a certain RecordType, that reference ``record``
+
+        Returns:
+            Identifiable, the identifiable for record.
         """
 
         registered_identifiable = self.get_registered_identifiable(record)