fixed roboNurse grammar

ps-grammar/roboNurse/roboNurse.jsgf

 #JSGF V1.0;
 grammar roboNurse;
 
-public <root> = [tobi] [please] (<command>);
+public <root> = [tobi] [please] (<command>|<>);
 <command> = (<assistance>|<pills>|<pillsspec>);
 
 <assistance> = [i need] [your] assistance;
-<pills> = [i need] [my] (pills|pill);
+<pills> = [i need] [my] (pills|pill|<aspirin>|<milk>|<coffee>|<coke>);
 <pillsspec> = [i need] [the] <properties> (one|bottle);
 
 <properties> = (left most|right most|blue|red|green|big|small);
+
 <aspirin>=aspirin;
 <milk> = milk;
 <coffee>=coffee;