Update README.md

RAMSES/README.md

@@ -83,3 +83,10 @@ cd testcase_XXX
 ```
 And getting no error code returned.
 Those steps can also be used in a batch file for running the simulation using a job scheduler.
+
+***Run:***
+Information about jobs to be launched can be found in the READ.md file of each test case (testcase_small, testcase_medium and testcase_large).
+
+***Validation:***
+- Metric: The metric used to bench is the total time of the simulation in seconds excluding initialization and I/Os. (For more details see the validate.sh script). 
+- physical: ? (TODO)