[math4] Math4 at SugarLabs.org

[Karlie Robinson]

I made an executive decision and we now have a landing page at 
http://sugarlabs.org/go/Math4

Feel free to add to the page and create a subpage or two. 

I chose the heading of Math 4 because we can use the play on words to 
eventually expand to other grade levels.  Math for Kindergarten, Math 
for Grade 1, etc. 

~Karlie