update README

README.md

@@ -6,3 +6,29 @@ This framework revolves mainly around 7 axes: simulators, worlds, robots, interf
 ## Requirements
 
 The framework has been tested with Python 2.7 and Ubuntu 16.04.
+
+## Installation
+
+1. First download the `pip` Python package manager and create a virtual environment for Python 2.7 as described in the following link: https://packaging.python.org/guides/installing-using-pip-and-virtualenv/
+On Ubuntu, in the terminal, you can type: 
+```bash
+sudo apt install python-pip
+sudo pip install virtualenv
+```
+
+2. clone this repository and install the requirements and the setup.py
+```bash
+pip install -r requirements.txt
+pip install -e .
+```
+
+## Citation
+
+```
+@misc{delhaisse2019pyrobolearn,
+    author = {Delhaisse, Brian and Rozo, Leonel, and Caldwell, Darwin},
+    title = {PyRoboLearn: A Python Framework for Robot Learning Practitioners},
+    howpublished = {\url{https://github.com/robotlearn/pyrobolearn}},
+    year=2019,
+}
+```