Added: PolygonShape.h and PolygonShape.m - very slow to build
Removed : Derived data and added updated README.rm
updated: README.md
Merge remote-tracking branch 'origin/master'

Conflicts:
	COMP41550-DwanPaula-13208660_Assignment2/Assignment_2_code/HelloPolly/HelloPolly.xcodeproj/project.xcworkspace/xcshareddata/HelloPolly.xccheckout
	COMP41550-DwanPaula-13208660_Assignment2/Assignment_2_code/HelloPolly/HelloPolly/PolygonShape.h
	COMP41550-DwanPaula-13208660_Assignment2/Assignment_2_code/HelloPolly/HelloPolly/PolygonShape.m