New Readme.md
- Contributors added to the readme.md

Everyone who have already contibuted to the repository is (I hope) listed
with his exact role.
Merge branch 'new_readme' of http://github.com/LeMagnesium/minetest-minetestforfun-server into new_readme

Conflicts:
	README.md
I don't know how to create new line with MDown..