Added .gitignore info to readme
Added .gitignore info to readme

arjunmantri/IgniteEngine-iOS,RobertWalsh/IgniteEngine-iOS,arjunmantri/IgniteEngine-iOS,r3mus/IgniteEngine-iOS,r3mus/IgniteEngine-iOS,arjunmantri/IgniteEngine-iOS,RobertWalsh/IgniteEngine-iOS,r3mus/IgniteEngine-iOS,RobertWalsh/IgniteEngine-iOS