Update README.rst

added back installation instructions

Author: brentru

README.rst

@@ -19,9 +19,36 @@ A Python client and examples for use with `io.adafruit.com <https://io.adafruit.
 
 Compatible with Python 3.6+
 
-Documentation
+Installation
 ================
 
+Easy Installation
+~~~~~~~~~~~~~~~~~
+If you have `PIP <https://pip.pypa.io/en/stable/installing/>`_ installed (typically with apt-get install python-pip on a Debian/Ubuntu-based system) then run:
+
+.. code-block:: shell
+
+   pip install adafruit-io
+
+This will automatically install the Adafruit IO Python client code for your Python scripts to use. You might want to examine the examples folder in this GitHub repository to see examples of usage.
+
+
+Manual Installation
+~~~~~~~~~~~~~~~~~~~
+
+Clone or download the contents of this repository. Then navigate to the folder in a terminal and run the following command:
+
+
+.. code-block:: shell
+
+   python setup.py install
+
+
+
+
+Usage 
+=====
+
 Documentation for this project is `available on the ReadTheDocs <https://adafruit-io-python-client.readthedocs.io/en/latest/>`_.