(Som) Add the structure and placeholders for Somali RG

src/api/CombinatorsSom.gf

@@ -0,0 +1,7 @@
+--# -path=.:alltenses:prelude:src/somali
+
+resource CombinatorsSom = Combinators with
+  (Cat = CatSom),
+  (Structural = StructuralSom),
+  (Noun = NounSom),
+  (Constructors = ConstructorsSom) ** open MissingSom in {}  ;