Added dependencies to README.

README.txt

-Use main.bat to run on a Windows machine, run main.py on a Linux machine.
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+Python package dependecies:
+- OpenGL
+- Kivy (+ PyGame)
+- VTK
+
+Install dependencies on Ubuntu Linux:
+$ sudo apt-get install python-opengl python-kivy python-vtk
+
+Install dependencies on Windows:
+go here: http://www.lfd.uci.edu/~gohlke/pythonlibs/
+Install the following packages:
+- PyOpenGL-3.0.1.win32-py2.7.exe
+- pygame-1.9.2pre.win32-py2.7.exe
+- Kivy-1.1.1.win32-py2.7.exe
+- VTK-5.8.0.win32-py2.7.exe
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