Create credit page

[ODXT]

Add devRant usernames, possibly attached with GitHub names, into a list. To be added at the end of book to be credited.

[FilipeRamalho]

Should I make one with all that have till this moment commited something and @Parou for the art work ?

[ODXT]

Yes, we can always modify it later.

[FilipeRamalho]

f928c77 adds a credit page.