Update README.md (#136)

Update README with example from :

https://sportslabkit.readthedocs.io/en/latest/notebooks/01_get_started/introduction_to_sportslabkit.html

On example in current README the following error is thrown:

AttributeError: module 'sportslabkit' has no attribute 'mot'

README.md

@@ -64,14 +64,20 @@ To get started with tracking your first game, follow this simple example:
 ```python
 import sportslabkit as slk
 
+from sportslabkit.mot import SORTTracker
+
 # Initialize your camera and models
 cam = slk.Camera(path_to_mp4)
-det_model = slk.detection_model.load('YOLOv8x')
-motion_model = slk.motion_model.load('KalmanFilter')
+det_model = slk.detection_model.load('YOLOv8x', imgsz=640)
+motion_model = slk.motion_model.load('KalmanFilter', dt=1/30, process_noise=10000, measurement_noise=10)
 
 # Configure and execute the tracker
-tracker = slk.mot.SORTTracker(detection_model=det_model, motion_model=motion_model)
-bbdf = tracker.track(cam)
+tracker = SORTTracker(detection_model=det_model, motion_model=motion_model)
+tracker.track(cam[:100])
+res = tracker.to_bbdf()
+
+save_path = "assets/tracking_results.mp4"
+res.visualize_frames(cam.video_path, save_path)
 
 # The tracking data is now ready for analysis
 ```