started Croatian, some noun declensions in place

src/croatian/TextHrv.gf

@@ -0,0 +1,8 @@
+concrete TextHrv of Text = CatHrv ** open ResHrv in {
+
+  lin
+    TEmpty = {s = []} ;
+    TFullStop x xs = {s = x.s ++ "." ++ xs.s} ;
+    TQuestMark x xs = {s = x.s ++ "?" ++ xs.s} ;
+    TExclMark x xs = {s = x.s ++ "!" ++ xs.s} ;
+}