add discriptions in README.md.

Author: kanait

README.md

@@ -1,2 +1,35 @@
+# bspsgpu
+
+bspsgpu is a research code for evaluating non-uniform B-spline surfaces on GPUs, which includes an implementation of the following paper:
+
+Takashi Kanai: “Fragment-based Evaluation of Non-Uniform B-spline Surfaces on GPUs”, Computer-Aided Design and Applications (Proc. CAD’07 Conference, Honolulu, Hawaii, 25-29 June, 2007), Vol.4, Nos.1-4, pp.287-294, 2007.
+
+This software was originally developed in 2004-2007 and was renovated in 2021 so as to build successfully by Visual Studio 2019.
+
+## Getting Started
+
+This software can run only on Windows. 
+
+## Prerequisites
+
+The following libraries are at least required for successfully compiling this software.
+
+### [openNURBS](https://www.rhino3d.com/opennurbs/)
+
+### [Cg Toolkit](https://developer.nvidia.com/cg-toolkit/)
+
+### [zlib](https://zlib.net/)
+
+### [libpng](http://www.libpng.org/pub/png/libpng.html)
+
+### [glew](http://glew.sourceforge.net/)
+
+### glut
+
+## Authors
+
+* **[Takashi Kanai](https://graphics.c.u-tokyo.ac.jp/hp/en/)** - The University of Tokyo
+
 ## License
-MIT
+
+This software is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details.