make parser slightly more user friendly (default to 'help')

client/cmdmain.c

@@ -20,7 +20,7 @@ static int CmdQuit(const char *Cmd);
 
 static command_t CommandTable[] = 
 {
-  {"help",  CmdHelp,  1, "This help"},
+  {"help",  CmdHelp,  1, "This help. Use '<command> help' for details of the following commands:\n"},
   {"data",  CmdData,  1, "Plot window / data buffer manipulation"},
   {"exit",  CmdQuit,  1, "Exit program"},
   {"hf",    CmdHF,    1, "HF commands"},
@@ -135,4 +135,4 @@ void UsbCommandReceived(UsbCommand *UC)
     PrintAndLog("unrecognized command %08x\n", UC->cmd);
     break;
   }
-}
+}