added windows comments in readme

This program compiles on linux and mac (it may also work on windows, though

it was not tested). It requires:

This program compiles on GNU/Linux, Mac and Windows (this port is currently

in development). It requires:

-qmake,

-make,

-g++ (maybe other compilers work),

-g++ in GNU/Linux or Mac

-Visual C++ in Windows

-Qt 4,

-OpenGL 3.1 or GLew 1.5.2,

-libnetpbm, and

-glut or freeglut.

-freeglut (maybe it also works with glut),

-libjpeg, and

-libnetpbm (if using any compiler other than Visual C++).

To build, simply run qmake and make.

In windows, you need to get some libjpeg and libnetpbm from the GnuWin32

project (http://gnuwin32.sourceforge.net). Additionally, you need flex

because it contains an implementation of unistd.h.

To build in GNU/Linux and Mac, simply run qmake and make. In Windows, it

would be easier to go thru QtCreator.

To configure, you can set in the file ~/.panorc the following options.

        shader_dir=<path to directory containing the shader files>