Update README for 2.1

Author: julielangou

.gitignore

@@ -0,0 +1,18 @@
+*.o
+*.oo
+BLACS/INSTALL/cmake_install.cmake
+BLACS/INSTALL/Makefile
+BLACS/INSTALL/x*
+TESTING/x*
+REDIST/TESTING/x*
+PBLAS/TESTING/x*
+PBLAS/TESTING/PB_Cabort.c
+PBLAS/TESTING/PB_Cwarn.c
+PBLAS/TIMING/x*tim
+PBLAS/TIMING/PB_Cabort.c
+PBLAS/TIMING/PB_Cwarn.c
+*.a
+BLACS/TESTING/xCbtest
+BLACS/TESTING/xFbtest
+SLmake.inc
+

README

@@ -23,6 +23,9 @@ ScaLAPACK README FILE
  VERSION 2.0 :  November, 2011
    VERSION 2.0.1 :  January, 2012
    VERSION 2.0.2 :  May, 2012
+ 
+ VERSION 2.1 :  Nov, 2019
+
 
 ScaLAPACK, or Scalable LAPACK, is a library of high performance linear
 algebra routines for distributed memory computers supporting MPI.
@@ -32,6 +35,12 @@ can be obtained via the World Wide Web or anonymous ftp.
 
     http://www.netlib.org/scalapack/
 
+=============== GitHub Repository ================
+
+https://github.com/Reference-ScaLAPACK/scalapack/
+
+==================================================
+
 ScaLAPACK, version 2.0, includes routines for the solution of dense,
 band, and tridiagonal linear systems of equations, condition estimation and
 iterative refinement, for LU and Cholesky factorization, matrix inversion,