v1.0.0 for ESP8266 multi synchronized PWM-channels

### Releases v1.0.0

1. Initial coding for ESP8266 boards using [ESP8266 core v3.0.2+](https://github.com/esp8266/Arduino/releases/tag/3.0.2)

Author: khoih-prog

README.md

@@ -49,7 +49,7 @@
 
 ## Features
 
-This library enables you to use Interrupt from Hardware Timers on an ESP8266-based board to create and output PWM to pins.
+This library enables you to use Interrupt from Hardware Timers on an ESP8266-based board to create and output PWM to pins. The maximum PWM frequency is currently limited at **500Hz**.
 
 ---
 
@@ -764,7 +764,7 @@ Channel : 7	Period : 125000		OnTime : 68750	Start_Time : 2072624
 
 Debug is enabled by default on Serial.
 
-You can also change the debugging level (_TIMERINTERRUPT_LOGLEVEL_) from 0 to 4
+You can also change the debugging level (_PWM_LOGLEVEL_) from 0 to 4
 
 ```cpp
 // These define's must be placed at the beginning before #include "ESP8266_PWM.h"