Added info to readme about usage and contributing.
Added info to readme about usage and contributing.

anuragpapineni/Hearthbreaker-evolved-agent,slaymaker1907/hearthbreaker,slaymaker1907/hearthbreaker,pieiscool/edited-hearthbreaker,anuragpapineni/Hearthbreaker-evolved-agent,noa/hearthbreaker,pieiscool/edited-hearthbreaker,danielyule/hearthbreaker,kingoflolz/hearthbreaker,Ragowit/hearthbreaker,jirenz/CS229_Project,anuragpapineni/Hearthbreaker-evolved-agent