Added basic information on installation; linked to the main

documentation as well

README.md

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+Installation
+============
+
+You can easily install PythonPDEVS with the following command.
+```sh
+cd src
+python setup.py install --user
+```
+
+Distributed simulation (optional)
+---------------------------------
+
+To use distributed simulation capabilities, run the script *install_mpi4py.sh* to install the necessary MPI library and bindings.
+
+Documentation
+=============
+
+Detailed documentation of the installation and use of PythonPDEVS can be found in the [PythonPDEVS documentation](https://msdl.uantwerpen.be/documentation/PythonPDEVS).