Create /extras folder

Created /extras folder and moved PwmPin and RFControl files from src into src/extras.

examples/Intermediate/6-DimmableLED/6-DimmableLED.ino

@@ -29,7 +29,7 @@ void setup() {
   // you can download that mimics or reproduces analogWrite() in some form or another.  HomeSpan conveniently comes with
   // it own version of a wrapper around the ESP32 PWM classes that make it very easy to define PWM "channel," attach a pin,
   // and set the PWM level (or duty cycle) from 0-100%.  These functions are encapsualted in the PwmPin class, as defined in
-  // PwmPin.h.  We will include this file in our updated DEV_LED.h for use with DEV_DimmableLED.
+  // extras/PwmPin.h.  We will include this file in our updated DEV_LED.h for use with DEV_DimmableLED.
   
   Serial.begin(115200);
 

examples/Intermediate/6-DimmableLED/DEV_LED.h

@@ -3,7 +3,7 @@
 //   DEVICE-SPECIFIC LED SERVICES //
 ////////////////////////////////////
 
-#include "PwmPin.h"                                 // NEW! Include this HomeSpan "extra" to create LED-compatible PWM signals on one or more pins
+#include "extras/PwmPin.h"                          // NEW! Include this HomeSpan "extra" to create LED-compatible PWM signals on one or more pins
 
 struct DEV_LED : Service::LightBulb {               // ON/OFF LED
 
@@ -58,7 +58,7 @@ struct DEV_DimmableLED : Service::LightBulb {       // Dimmable LED
     // request the LED be turned off, but retain the brightness level so that it does not need to be resent if
     // the LED is turned back on.  Multiplying the newValue of the power Characteristic (as a boolean) with the
     // newValue of the Brightness Characteristic (as an int) is a short-hand way of creating the logic to
-    // determing the PWM level when the LED is off (always zero) or on (whatever the brightness level is).
+    // set the PWM level when the LED is off (always zero) or on (whatever the brightness level is).
     
     pwmPin->set(channel,power->newValue.BOOL*level->newValue.INT);    
    

src/extras/extras.ino

@@ -0,0 +1,5 @@
+
+#error THIS IS NOT COMPILABLE CODE
+
+This is a dummy .ino file that allows you to easily edit the contents of this library using the Arduino IDE.
+The code is NOT designed to be compiled from this point.  Compile and test the library using one of the examples.