Add A4988 stepper motor driver

[Anshuflame04]

Title

Add A4988 Stepper Motor Driver

Overview

This pull request adds a driver for the A4988 stepper motor, enabling precise motor control using MicroPython.

Changes Made

• a4988.py: Functions for motor control (forward, backward, speed adjustment).
• main.py: Example usage to demonstrate motor control with user switches.

Testing Instructions

1. Connect the A4988 driver to your microcontroller.
2. Run main.py to control the stepper motor.
3. Use switches to adjust direction and speed.

[Anshuflame04]

git commit --amend -s -m "drivers/a4988: Add A4988 stepper motor driver."

[Anshuflame04]

git commit --amend -s -m "drivers/a4988: Add A4988 stepper motor driver for esp32.

[Anshuflame04]

git commit --amend -s -m "drivers/a4988: Added A4988 stepper motor driver for esp32."