started Croatian, some noun declensions in place

src/croatian/GrammarHrv.gf

@@ -0,0 +1,19 @@
+--# -path=.:../abstract:../common:prelude
+
+concrete GrammarHrv of Grammar = 
+  NounHrv, 
+  VerbHrv, 
+  AdjectiveHrv,
+  AdverbHrv,
+  NumeralHrv,
+  SentenceHrv,
+  QuestionHrv,
+  RelativeHrv,
+  ConjunctionHrv,
+  PhraseHrv,
+  TextHrv,
+  StructuralHrv,
+  IdiomHrv,
+  TenseHrv
+  ** {
+}