(Som) Add the structure and placeholders for Somali RG

src/somali/AdverbSom.gf

@@ -0,0 +1,38 @@
+concrete AdverbSom of Adverb = CatSom ** open ResSom, ParamSom, Prelude in {
+
+lin
+
+  -- : A -> Adv ;
+  --PositAdvAdj adj = { } ;
+
+  -- : CAdv -> A -> NP -> Adv ; -- more warmly than John
+  -- ComparAdvAdj cadv a np = { } ;
+
+--    ComparAdvAdjS : CAdv -> A -> S  -> Adv ; -- more warmly than he runs
+
+  -- : Prep -> NP -> Adv ;
+  PrepNP prep np = {s = prep.s ! np.a ; s2 = np.s ! Abs} ; ---- ?
+
+-- Adverbs can be modified by 'adadjectives', just like adjectives.
+
+    --AdAdv  : AdA -> Adv -> Adv ;             -- very quickly
+  AdAdv ada adv = adv ** { s = ada.s ++ adv.s } ;
+-- Like adverbs, adadjectives can be produced by adjectives.
+
+  -- : A -> AdA ;                 -- extremely
+--  PositAdAAdj a = { } ;
+-- Subordinate clauses can function as adverbs.
+
+    --: Subj -> S -> Adv ;
+--  SubjS subj s = {} ;
+
+-- Comparison adverbs also work as numeral adverbs.
+
+    --AdnCAdv : CAdv -> AdN ;                  -- less (than five)
+    --AdnCAdv cadv = {s = } ;
+} ;
+
+{-
+gt PrepNP in_Prep (DetCN (DetQuant DefArt ?) (UseN ?) | l -bind
+gt PrepNP from_Prep (DetCN (DetQuant DefArt ?) (UseN ?)) | l -bind
+-}