v1.0.0 for RP2040 hardware-based PWM

### Initial Releases v1.0.0 1. Initial coding to support **RP2040-based boards** such as Nano_RP2040_Connect, RASPBERRY_PI_PICO, etc. using either RP2040 [**ArduinoCore-mbed mbed_nano or mbed_rp2040** core](https://github.com/arduino/ArduinoCore-mbed) or [**Earle Philhower's arduino-pico core**](https://github.com/earlephilhower/arduino-pico) 2. The purely hardware-based PWM channel can generate from very low (lowest is 7.5Hz) to very high PWM frequencies (in the **MHz** range, up to **62.5MHz**).
khoih-prog · Sep 23, 2021 · 598f0d2 · 598f0d2
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,32 @@
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@
   * [2. Initizlize PWM Instance](#1-Initizlize-PWM-Instance)
 * [Examples](#examples)
   * [ 1. PWM_Multi](examples/PWM_Multi)
- [Example PWM_Multi](#example-PWM_Multi)
+* [Example PWM_Multi](#example-PWM_Multi)
 * [Debug Terminal Output Samples](#debug-terminal-output-samples)
   * [1. PWM_Multi on MBED RaspberryPi Pico](#1-PWM_Multi-on-MBED-RaspberryPi-Pico)
   * [2. PWM_Multi on RASPBERRY_PI_PICO](#2-PWM_Multi-on-RASPBERRY_PI_PICO)
@@ -185,7 +185,7 @@ OR of those two GPIO inputs
 
 Before using any PWM `slice`, you have to make sure the `slice` has not been used by any other purpose.
 
-### 1. Create PWM Instance with Pin, Frequency and dutycycle
+#### 1. Create PWM Instance with Pin, Frequency and dutycycle
 
 ```
 RP2040_PWM* PWM_Instance;