add papers
Merge branch 'master' of github.com:jmh045000/utd_cs6301_project

Conflicts:
	lit_review/virtual reality/Design and Evaluation of Domain-Specific.pdf
	lit_review/virtual reality/SKETCH An Interface for Sketching 3D Scenes.pdf
	lit_review/virtual reality/Surface Drawing Creating Organic 3D Shapes.pdf
	lit_review/virtual reality/VSMM95gifu-3DModelers-Green.pdf