How to add "drift" to this camera rotate script?

Unity Engine
1

Hi, I found this nice script to rotate a camera around an object using Touch: Using touch to rotate around an object - Unity Engine - Unity Discussions

It works well, but the move just stops dead when the touch ends. Is there a way to add some inertia so that the move drifts to a stop after the touch ends?

var target : Transform;
var distance = 10.0;
var xSpeed = 250.0;
var ySpeed = 120.0;
var yMinLimit = -20;
var yMaxLimit = 80;
private var x = 0.0;
private var y = 0.0;
var xsign =1;
@script AddComponentMenu("Camera-Control/Mouse Orbit")
function Start () {
    var angles = transform.eulerAngles;
    x = angles.y;
    y = angles.x;
  
    var rotation = Quaternion.Euler(y, x, 0);
    var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
      
        transform.rotation = rotation;
        transform.position = position;
  
}
function LateUpdate () {
  
  
    //get the rotationsigns
  
    var forward = transform.TransformDirection(Vector3.up);
    var forward2 = target.transform.TransformDirection(Vector3.up);
     if (Vector3.Dot(forward,forward2) < 0)
            xsign = -1;
            else
            xsign =1;
  
  
    for (var touch : Touch in Input.touches) {
    if (touch.phase == TouchPhase.Moved) {
        x += xsign * touch.deltaPosition.x * xSpeed *0.02;
        y -= touch.deltaPosition.y * ySpeed *0.02;
      
      
              
        var rotation = Quaternion.Euler(y, x, 0);
        var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
      
        transform.rotation = rotation;
        transform.position = position;
    }
    }
}
2

Add two new variables, let’s say inertiaX and inertiaY, and set them appropriately to the touch input’s delta position. Use those values in your calculations and decay them over time.

3

Sorry, I should have mentioned I’m a beginner with scripting…any hints on how to “set them appropriately to the touch input’s delta position. Use those values in your calculations and decay them over time” ?