Update README.md

My today's work report.

- I have worked on throwing an arrow on fire button and added collision event for it.

- I have worked on giving score and displaying splats related to it when an arrow is collided with any bad guy.

- I have worked on making changes to some code so that it can be manageable

- I have worked on solving issues those are occurring in client's various devices.

-I have disabled Google Play Game Services for now so that it can work in client's device.
And now hopefully it can also run in iPhone.