Please add a static abstract factory method(s) to create a Unit Quantity

[Jakar510]

Please add a static abstract factory method(s) to create a Unit Quantity such as described below:

    public interface IQuantity<TSelf, TUnitType, out TValueType> ...  
    {
        public abstract static TSelf From(QuantityValue value, TUnitType fromUnit);
        ...
    }