improve README.md

-# Engage
+# engage
 
-## abstract
+A basic 3D library in C++.
 
-Old C++ code originally intended to be a 3D math playground.
+## Synopsis
 
-## requirements
+I have no longer any clue how to use this and it is probably broken anyway.
 
-Gnu C++
+## Description
 
-## status
+This was created as a fun project to learn more about 3D mathematics. It was
+never finished but is still interesting (at least for me). Sadly the last time
+I tried it doesn't compile anymore.
 
-The last time I tried this does not build anymore.
\ No newline at end of file
+## Requirements
+
+ * GNU C++
+
+## Contributing
+
+Just email me.
+
+## License
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+    
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+## Author
+
+Georg Hopp <georg@steffers.org>