add chrono simulator skeleton file

pyrobolearn/simulators/chrono.py

@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+#!/usr/bin/env python
+"""Define the Chrono Simulator API.
+
+Dependencies in PRL: None
+
+References:
+    - [1] Chrono - An Open Source Multi-physics Simulation Engine: https://projectchrono.org/
+    - [1] PyChrono: http://projectchrono.org/pychrono/
+"""
+
+# import standard libraries
+import os
+import time
+import numpy as np
+from collections import OrderedDict
+
+# import pychrono
+try:
+    import pychrono as chrono
+except ImportError as e:
+    raise ImportError(e.__str__() + "\n: HINT: you can install `pychrono` by following the instructions given at: "
+                                    "http://api.projectchrono.org/development/pychrono_installation.html")
+
+# import PRL simulator
+from pyrobolearn.simulators.simulator import Simulator
+
+# check Python version
+import sys
+if sys.version_info[0] < 3:
+    raise RuntimeError("You must use Python 3 with the Dart simulator.")
+
+
+__author__ = "Brian Delhaisse"
+__copyright__ = "Copyright 2019, PyRoboLearn"
+__credits__ = ["Brian Delhaisse"]
+__license__ = "GNU GPLv3"
+__version__ = "1.0.0"
+__maintainer__ = "Brian Delhaisse"
+__email__ = "briandelhaisse@gmail.com"
+__status__ = "Development"
+
+
+class Chrono(Simulator):
+    r"""Chrono simulator class.
+
+    """
+    pass