Add README.md

README.md

+# Sample code for preparing to use 2S-SOM algorithm.
+
+This sample code shows with un example how to train a SOM Map using 2S-SOM algorithm and data from a geophysical exemple.
+
+## The example problem:
+--
+Using a three-physical-variables two-groups problem to be trained using the 2S-SOM
+algorithm. We are only interested here, for instance, in the group coefficients
+ALPHA, and we let the variables or columns coefficients, BETA, constant and
+equal. This will be driven by a particular use of Lambda and Eta input
+parameters. See code.
+
+Data array dimension is 36 x N.  36 is the composition of thee geophysical
+variable dimensions of (12, 12, 12) and N the number of patterns.
+
+We take the first 12 columns, for the first 2S-SOM group and the rest, 24 columns,
+for the second group.
+