#5 -> draft -> Example 2

this commit provides the second example that is to explain
- the way of the force for association
- how to use particular association
- what the hell is mappedBy association's property

and so one

Additionaly some documentation for qubic1 has been changed.
These changes were dictated by qubic2

Signed-off-by: kornicameister <kornicameister@gmail.com>