Create README.md

Author: AmberAbernathy

README.md

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+# Color_Quantization
+
+  Program to perform color quantization using four k-means variants:
+  1) Batch K-Means (Forgy, 1965 and Lloyd, 1982)
+  2) Incremental Batch K-Means (Linde et al., 1980)
+  3) Online K-Means (MacQueen, 1967)
+  4) Incremental Online K-Means (Abernathy & Celebi, 2022)
+
+  Authors: Amber Abernathy & M. Emre Celebi
+
+  Contact email: ecelebi@uca.edu
+
+  If you find this program useful, please cite:
+  A. D. Abernathy and M. E. Celebi, 
+  The Incremental Online K-Means Clustering Algorithm 
+  and Its Application to Color Quantization,
+  Expert Systems with Applications,
+  in press, https://doi.org/10.1016/j.eswa.2022.117927, 2022.
+
+  Compilation:
+  g++ -O3 -std=c++11 -o test_km_algs test_km_algs.cpp -lm
+
+  or
+  
+  g++ -Ofast -std=c++11 -o test_km_algs test_km_algs.cpp -lm
+
+  Displaying command-line options:
+  ./test_km_algs
+
+  Notes: 
+         1) The program requires C++11 or later due to its use of <chrono> (for 
+	    measuring time). If your compiler does not support C++11, you should
+	    measure time another way or eliminate time measurement.
+	 2) This program does not use any object-oriented features of C++. 
+	    Therefore, it should be straightforward to port it to C or Java.
+