add description in readme

readme.txt

+This project contains implementations in Ocaml of algorithms for
+recognition of Robinson dissimilarities, as well as random generators
+of dissimilarities. The primary goal is to provide an implementation
+of the algorithm proposed by Carmona, Chepoi, Naves and Préa. We
+actually give two implementations, in imperativeCCNP.ml (a mostly
+imperative implementation) and robinsonCCNP.ml (a more functional
+implementation). The two implementations are equivalent, except for
+their respective performance which slightly differs from one another.
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 0) Need OCaml installed. Easy way: 
 sudo apt-get install opam
 opam init
@@ -11,8 +25,7 @@ see https://ocaml.org/learn/tutorials/up_and_running.html
 dune build
 
 2) execute: 
-cat my_matrix | dune exec copoint 
-cat instance_1 | sed "s/,\|\[\|]//g" | dune exec copoint
+cat matrices/mat1 | dune exec copoint 
 
 
 Run test: