Update payload_extension.cpp added example code

stempayload/Payload_BME280_MPU6050_XS/payload_extension.cpp

@@ -9,7 +9,7 @@
 // put your setup code here
 void payload_setup() {
   
-  Serial.println("Starting new sensor!");
+//  Serial.println("Starting new sensor!");
 
 }
 
@@ -17,4 +17,9 @@ void payload_setup() {
 // Very Important: only use print, not println!!
 void payload_loop() {
 
+/*  
+  Serial1.print(" NEW 0.0");  // send sensor data over serial to Pi Zero
+  Serial.print(" NEW 0.0");   // send sensor data over serial monitor for testing
+*/
+  
 }