Update README.md

Author: khoih-prog

README.md

@@ -70,18 +70,20 @@ This library enables you to use Hardware Timers on an STM32H7-based Portenta_H7
 
 This library is using the **same or similar functions** as other FastPWM libraries, as follows, to enable you to **port your PWM code easily between platforms**
 
-- [**RP2040_PWM**](https://github.com/khoih-prog/RP2040_PWM)
-- [**AVR_PWM**](https://github.com/khoih-prog/AVR_PWM)
-- [**megaAVR_PWM**](https://github.com/khoih-prog/megaAVR_PWM)
-- [**ESP32_FastPWM**](https://github.com/khoih-prog/ESP32_FastPWM)
-- [**SAMD_PWM**](https://github.com/khoih-prog/SAMD_PWM)
-- [**SAMDUE_PWM**](https://github.com/khoih-prog/SAMDUE_PWM)
-- [**nRF52_PWM**](https://github.com/khoih-prog/nRF52_PWM)
-- [**ATtiny_PWM**](https://github.com/khoih-prog/ATtiny_PWM)
-- [**Teensy_PWM**](https://github.com/khoih-prog/Teensy_PWM)
-- [**MBED_RP2040_PWM**](https://github.com/khoih-prog/MBED_RP2040_PWM)
-- [**nRF52_MBED_PWM**](https://github.com/khoih-prog/nRF52_MBED_PWM)
-- [**STM32_PWM**](https://github.com/khoih-prog/STM32_PWM)
+ 1. [**RP2040_PWM**](https://github.com/khoih-prog/RP2040_PWM)
+ 2. [**AVR_PWM**](https://github.com/khoih-prog/AVR_PWM)
+ 3. [**megaAVR_PWM**](https://github.com/khoih-prog/megaAVR_PWM)
+ 4. [**ESP32_FastPWM**](https://github.com/khoih-prog/ESP32_FastPWM)
+ 5. [**SAMD_PWM**](https://github.com/khoih-prog/SAMD_PWM)
+ 6. [**SAMDUE_PWM**](https://github.com/khoih-prog/SAMDUE_PWM)
+ 7. [**nRF52_PWM**](https://github.com/khoih-prog/nRF52_PWM)
+ 8. [**Teensy_PWM**](https://github.com/khoih-prog/Teensy_PWM)
+ 9. [**ATtiny_PWM**](https://github.com/khoih-prog/ATtiny_PWM)
+10. [**Dx_PWM**](https://github.com/khoih-prog/Dx_PWM)
+11. [**Portenta_H7_PWM**](https://github.com/khoih-prog/Portenta_H7_PWM)
+12. [**MBED_RP2040_PWM**](https://github.com/khoih-prog/MBED_RP2040_PWM)
+13. [**nRF52_MBED_PWM**](https://github.com/khoih-prog/nRF52_MBED_PWM)
+14. [**STM32_PWM**](https://github.com/khoih-prog/STM32_PWM)
 
 
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