Added flags to language specifiction. Added optional expect string to language specification. Added some exaple grammars for testing and demos

examples/minimal.smallc

@@ -0,0 +1,11 @@
+#include "stdio.h"
+
+main() {
+
+  int i;
+  int j;
+
+  j = 10;
+  
+  return 0;
+}