drift/skid in topdown racer with libgdx/java

I’m trying to do a simple top-down racing game and is struggeling to get the steering right.

At the moment I’m using a very simple steering and want to add some drifting to the car.
I’ve read some tutorials about it but haven’t found a good one that will be easy to implement in my code.
Mabye I will have to rewrite my code for the purpose but I want to know if it could be easy implemented in my code?

My code for steering is as follows

    public void steering(){
    /*
       Handles the steering
    */
    if (wleftBounds.contains(touchPos.x, touchPos.y) && startSeqDone==true){
        //move left
        direction += 0.04;
        velocity *= 0.97;
        carSprite.setRotation(carSprite.getRotation() + carRot);


    } else if (wrightBounds.contains(touchPos.x, touchPos.y) && startSeqDone==true){
        //move right
        direction -= 0.04;
        velocity *= 0.97;
        carSprite.setRotation(carSprite.getRotation() - carRot);


    }else if (accBounds.contains(touchPos.x, touchPos.y) && startSeqDone==true){
        //move forward
        velocity += 0.04;
        velocity *= 0.99;
        myx += velocity*Math.cos(direction);
        myy += velocity*Math.sin(direction);
    }
}

My question is how to implement drift/skid?