everything works
need to clean up
	modified:   .gitignore
	modified:   README.md
	new file:   src/threeSpace/ThreeShape.java
	new file:   src/threeSpace/ThreeSpacePanel.java
	new file:   src/threeSpace/UniverseFrame.java
	new file:   src/threeSpace/shape/LineSeg.java
	new file:   src/threeSpace/shape/RectanglePrism.java
	new file:   src/threeSpace/shape/Vertice.java