Function trackAddToCart

trackAddToCart(item): void
Tracks an add to cart event. Use this method to track items added to a shopping cart.
Parameters
- item: CartItem
  
  Item details.
Returns void
Example
```
FohrTracking.trackAddToCart({
  id: 'Item_123',
  price: 34.50,
  quantity: 2
})
```

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