Update README.md

I've added a link to each chapter and appendix for easy navigation
Small typo fix 

Changed "myLayer is not a child of myScene" to "myLayer is now a child of myScene"
Changed "rotating" to "scaling" for the scale example
Merge pull request #10 from kidproquo/patch-1

Small typo fix
Merge pull request #8 from MannyDev/patch-1

Update README.md
Merge pull request #11 from kidproquo/master

Changed "rotating" to "scaling" for the scale example
Merge remote-tracking branch 'refs/remotes/upstream/master'