Added more documentation for Python wrapper

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+How to run a new simulation
+===========================
+
+After installing WarpX as a Python package (see the section
+:doc:`../installation`), you can use its functionalities in a Python script
+to run a simulation.
+
+In order to run a new simulation:
+
+* Create a **new directory**, where the simulation will be run.
+
+* Add a **Python script** in the directory.
+
+This file contains the numerical and physical parameters that define
+the situation to be simulated.
+Example input files can be found in the section :doc:`examples`.
+
+* **Run** the script with Python:
+
+::
+
+    mpirun -np <n_ranks> python <python_script>
+
+where ``<n_ranks>`` is the number of MPI ranks used, and ``<python_script>``
+is the name of the script.