added help

cubesatsim/cubesatsim.ino

@@ -3615,7 +3615,20 @@ void serial_input() {
     switch(result) {
      case 'h':
      case 'H':
-       Serial.println("This help info");	     
+       Serial.println("You can change the following settings by typing the letter and hitting Send in the Serial Monitor:");	     
+       Serial.println("h   Show this help info");	  
+       Serial.println("a   Change to AFSK/APRS mode");	     
+       Serial.println("c   Change to CW mode");	     
+       Serial.println("f   Change to FSK/DUV mode");	     
+       Serial.println("b   Change to BPSK mode");	     
+       Serial.println("s   Change to SSTV mode");	     
+       Serial.println("i   Restarts CubeSatsim software");	     
+       Serial.println("c   Change the CALLSIGN in the configuration file sim.cfg");	     
+       Serial.println("t   Change the Simulated Telemetry setting in sim.cfg");	     
+       Serial.println("r   Change the Resets Count in the configuration file sim.cfg, or ");	     
+       Serial.println("    Reset payload and stored EEPROM values");	
+       Serial.println("l   Change the Latitude and Longitude in the configuration file sim.cfg");	     
+       Serial.println("?   Query payload sensors");	     
        break;
 		   
      case 'a':