update README to include variables for MPI

Setting USE_MPI=1 alone does not configure Legion to use the MPI backend. It must be coupled with REALM_NETWORKS=mpi.
StanfordLegion · Aug 26, 2020 · d626913 · d626913
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diff --git a/README.md b/README.md
@@ -154,6 +154,7 @@ make`) or at the top of each application's Makefile.
     level](http://legion.stanford.edu/debugging/#logging-infrastructure).
   * `USE_CUDA=<0,1>`: enables CUDA support.
   * `USE_GASNET=<0,1>`: enables GASNet support (see [installation instructions](http://legion.stanford.edu/gasnet/)).
+  * `USE_MPI=<0,1> REALM_NETWORKS=mpi`: enables MPI support.
   * `USE_LLVM=<0,1>`: enables LLVM support.
   * `USE_HDF=<0,1>`: enables HDF5 support.