food grammars added, with copyright statements

src/api/SymbolicAra.gf

@@ -0,0 +1,5 @@
+--# -path=.:present:mathematical:prelude
+
+resource SymbolicAra = Symbolic with 
+  (Symbol = SymbolAra),
+  (Grammar = GrammarAra) ;

src/api/SymbolicRus.gf

@@ -0,0 +1,5 @@
+--# -path=.:present:mathematical:prelude
+
+resource SymbolicRus = Symbolic with 
+  (Symbol = SymbolRus),
+  (Grammar = GrammarRus) ;