Add group folder and dummy grammar

psGrammar/challange/pollen/sandbox.jsgf

+#JSGF V1.0;
+grammar calculator;
+public <calcstring> = <robot> calculate <number> (plus | minus) <number>;
+
+<number> = (one | two | three | four | five | six | seven | eight | nine | zero);
+
+<robot> = (floka | meka | robot | tobi);