Added section on using an Select object
Added section on using an Select object

There was no previous mention in the docs of the possibility to use a
Select object to seed the validator. Added with example.

samsonasik/zf2-documentation,akrabat/zf2-documentation,gennadiylitvinyuk/zf2-documentation,Rud5G/zf2-documentation,rettal/zf2-documentation,Rud5G/zf2-documentation,rettal/zf2-documentation,samsonasik/zf2-documentation,gennadiylitvinyuk/zf2-documentation,akrabat/zf2-documentation