README Example does not compile

[VictorioBerra]

Regarding the EmployeeType/Manager example on the README, if you paste the two classes into LINQPad there are several errors.

For example ManagerType is private so the Manager class is not able to use it like it does in the example.

I realize its just an example, and it was probably written as pseudocode but I like to copy the examples off and experiment with them to try and understand the library better and I am probably not alone there.