updating readme

README.md

@@ -2,3 +2,23 @@ pso-clustering
 ==============
 
 PSO-Clustering algorithm [Matlab code]
+
+Author:  Augusto Luis Ballardini
+Email:   [email protected]
+Website: http://www.ira.disco.unimib.it/people/ballardini-augusto-luis/
+
+This library 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.
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3
+or any later version published by the Free Software Foundation;
+with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+A copy of the license is included in the section entitled "GNU
+Free Documentation License".
+
+The following code is inspired by the following paper:
+Van Der Merwe, D. W.; Engelbrecht, AP., "Data clustering using particle swarm optimization," 
+Evolutionary Computation, 2003. CEC '03. The 2003 Congress on , vol.1, no., pp.215,220 Vol.1, 8-12 Dec. 2003
+doi: 10.1109/CEC.2003.1299577
+URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1299577&isnumber=28874