* Create ledcWrite_demo_ESP32_RGB.ino
adding the public domain example ledcWrite_demo_ESP32.ino to this repo. Added RGB to the name for people searching, added some comments, and renames things to make a bit more sense.
* Update ledcWrite_demo_ESP32_RGB.ino
renamed to ledcWrite_RGB.ino and added a couple more comments based on https://github.com/espressif/arduino-esp32/issues/689
* Rename libraries/ESP32/examples/AnalogOut/ledcWrite_demo_ESP32_RGB/ledcWrite_demo_ESP32_RGB.ino to libraries/ESP32/examples/AnalogOut/ledcWrite_RGB/ledcWrite_RGB.ino
Renamed.
* Added LEDC Fade exmaple
* Renamed LEDCFade example to LEDCSoftwareFade
Added valueMax parameter for ledcAnalogWrite
* Remove usage of LED_BUILTIN constant to solve CI errors
