v1.0.1 to add PWM_StepperControl example

### Releases v1.0.1

1. Add example [PWM_StepperControl](https://github.com/khoih-prog/SAMD_PWM/tree/main/examples/PWM_StepperControl) to demo how to control Stepper Motor using PWM

Author: khoih-prog

changelog.md

@@ -17,6 +17,7 @@
 ## Table of Contents
 
 * [Changelog](#changelog)
+  * [Releases v1.0.1](#releases-v101)
   * [Releases v1.0.0](#releases-v100)
 
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