[Strategic] New tile layer guideline proposal doc

[Sam Larsen]

Hi all,

I have put together a page on the OSM.org wiki for us to use when we present the 
proposal for a new tile layer on the osm.org slippy map to the board.

http://wiki.openstreetmap.org/wiki/Strategic_working_group/New_Tile_Layer_Guidelines_Proposal


Most of it has evolved from the list recorded by Richard in a previous meeting 
of the SWG.

Pleae fill in any detail that i may have missed or the two TODO's that need to 
be finalised.

We will look to present this to the board within a week.

Sam