Added class ProductStaticData, TargetPrice and relative test class

Added class ProductStaticData, TargetPrice and relative test class.
It's still a working in progress.. 
I would like to save all the Target Prices of an equity to calculate the median forecasted target price for a given equity.
I would like to link products, for example equities, to their relative traded derivatives like Call or Put options.
Maybe doing so one could better identify price discrepancies between instruments of the same "family" ( the equity and relative derivatives), using a mathematical model? (Black Scholes formula?)