Authors name addition on NEP 17

[vncoelho]

@erikzhang contributed with organization, revisions on original idea and proposal analysis.
@shargon contributed with experimentation, testing and analysis.
@igormcoelho contributed with revisions on the original idea and proposal analysis.
@belane contributed with the original idea regarding the adjustment of onPayment.
@roman-khimov contributed with revisions, experimentation and testing (neo-go).
@vncoelho contributed with revisions on the original idea and verification.

[erikzhang]

When nominating the author’s name, please describe his contribution to the proposal.

[vncoelho]

@erikzhang, I am adding the description in the PR.

@igormcoelho @shargon @belane @roman-khimov, I added you to this PR and a brief description.
Fell free to update the PR.

Names have been added in alphabetic order.

@roman-khimov, I added your role as testing as well because I believe that soon as accepted you are also going to provide an example using the neo-go.

[vncoelho]

@erikzhang, ping @lllwvlvwlll and other previous authors of NEP-5 in order to invite them to join as co-authors as well.
Part of the text is still from NEP-5, as well as some logic behind.

[shargon]

Suggested change

	Author: Erik Zhang <erik@neo.org>, Fernando Díaz Toledano <shargon@gmail.com>, Igor Machado Coelho <igor.machado@gmail.com>, Jaime Kindelan <jaime@red4sec.com>, Roman Khimov <roman@nspcc.ru>, Vitor Nazário Coelho <vncoelho@gmail.com>
	Author: Erik Zhang <erik@neo.org>, Igor Machado Coelho <igor.machado@gmail.com>, Jaime Kindelan <jaime@red4sec.com>, Roman Khimov <roman@nspcc.ru>, Vitor Nazário Coelho <vncoelho@gmail.com>

I doesn't feel like an author

[vncoelho]

Ok,Shargon, I believe yes, you are contributing to make this standard solid.

[vncoelho]

If you are not going to include yourself I will also close this issue because the list will become quite strict.

We also need to check with previous nep5 authors.