More docs

rpc/README.md

@@ -12,6 +12,13 @@ $ java -cp "target/rpc-1.0.0-SNAPSHOT-jar-with-dependencies.jar:." server.rpc.Rp
 Or use IDE to start the main class at `/Users/ham/Projects/MontiSim/server/rpc/src/main/java/server/rpc/RpcServer.java`.   
 Don't forget to set the program argument telling rpc server on which port it should listen.
 
+## OpenModelica
+The simulator supports 2 different physic models: OpenModelica and masspoint vehicle model.
+To be able to use OpenModelica model, the `.fmu` files have to be compiled first.
+For further instructions please refer to: 
+[OpenModelica](https://git.rwth-aachen.de/monticore/EmbeddedMontiArc/simulators/server/blob/master/README.md#configuration-of-openmodelica)
+The `.fmu` files should be put `rpc/lib` directory.
+
 ## Docker
 Build the docker image after the jar is built:
 ```