Template for starting a new resource grammar (#441)

Also addressing this https://github.com/GrammaticalFramework/gf-rgl/issues/238 with a README that adds a suggested implementation order.

src/TEMPLATE/AdverbTMP.gf

@@ -0,0 +1,39 @@
+concrete AdverbTMP of Adverb = CatTMP ** open ResTMP, ParadigmsTMP, Prelude in {
+{-
+lin
+
+  -- : A -> Adv ;
+  PositAdvAdj adj =
+
+  -- : CAdv -> A -> NP -> Adv ; -- more warmly than John
+  ComparAdvAdj cadv a np =
+
+  -- : CAdv -> A -> S  -> Adv ; -- more warmly than he runs
+  ComparAdvAdjS cadv a s =
+
+  -- : Prep -> NP -> Adv ;
+  PrepNP prep np =  ;
+
+-- Adverbs can be modified by 'adadjectives', just like adjectives.
+
+  -- : AdA -> Adv -> Adv ;             -- very quickly
+  AdAdv ada adv = adv **
+
+-- 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 = {s = subj.s ++ s.s} ;
+
+-- Comparison adverbs also work as numeral adverbs.
+
+  -- : CAdv -> AdN ;                  -- less (than five)
+  AdnCAdv cadv =  ;
+
+-}
+
+}