Added pypi, removed installing section

Author: evaherrada

README.rst

@@ -20,18 +20,26 @@ changes such as mode. For I2C, it manages the device address.
 
 .. _bus_device_installation:
 
-Installation
--------------
-
-This library is **NOT** built into CircuitPython to make it easy to update. To
-install it either follow the directions below or `install the library
-bundle <bundle_installation>`_.
-
-To install:
-
-#. Download and unzip the `latest release zip <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice/releases>`_.
-#. Copy the unzipped ``adafruit_bus_device`` to the ``lib`` directory on the ``CIRCUITPY`` drive.
-
+On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
+PyPI <https://pypi.org/project/adafruit-circuitpython-busdevice/>`_. To install for current user:
+
+.. code-block:: shell
+    
+    pip3 install adafruit-circuitpython-busdevice
+    
+To install system-wide (this may be required in some cases):
+.. code-block:: shell
+    
+    sudo pip3 install adafruit-circuitpython-busdevice
+   
+To install in a virtual environment in your current project:
+.. code-block:: shell
+
+    mkdir project-name && cd project-name
+    python3 -m venv .env
+    source .env/bin/activate
+    pip3 install adafruit-circuitpython-busdevice
+    
 Usage Example
 =============