code blocks in readme

README.md

@@ -19,24 +19,29 @@ matrix-cancel:
 
 1. Build the LLNL-modified ROSS:
 
+    ```
     cd ross/src
     # Edit Makefile to set copmiler name (one of the first lines)
     # currectly the compiler is mpicxx (MPI C++ compiler necessary).
     # Make and copy library to ../lib directory:
     make
     make install
     cd ../..
+    ```
 
 2. Build matrix model:
 
+    ```
     cd matrix
     # Set compiler also in compile.matrix-model
     # Build:
     . compile.matrix-model
     cd ..
+    ```
 
 3. Run test:
 
+    ```
     cd matrix
     # Test run script usus mpirun to launch a parallel job.
     # this is a small test and runs as is on many login nodes,
@@ -49,17 +54,22 @@ matrix-cancel:
     # with sample output at the end of the run.matrix-model file.
     # See that file for more details.
     cd ..
+    ```
 
 4. Build matrix-cancel model:
 
+    ```
     cd matrix-cancel
     . compile.matrix-cancel
     cd ..
+    ```
 
 5. Run matrix-cancel test:
 
+    ```
     cd matrix-cancel
     ./runloop.sh
+    ```
 
    Test takes maybe a couple of minutes. Lots of text data is eventually
    dumped to the screen. This data is also saved in files with names