add Blinka to 'setup.py->install_requires'; add PyPI install & standard stuff to README

Author: sommersoft

README.rst

@@ -39,6 +39,32 @@ libraries. Please ensure they are also available on the CircuitPython filesystem
 This is easily achieved by downloading
 `a library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.
 
+Installing from PyPI
+--------------------
+   If the library is not planned for PyPI, remove the entire 'Installing from PyPI' section.
+On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
+PyPI <https://pypi.org/project/adafruit-circuitpython-pcf8523/>`_. To install for current user:
+
+.. code-block:: shell
+
+    pip3 install adafruit-circuitpython-pcf8523
+
+To install system-wide (this may be required in some cases):
+
+.. code-block:: shell
+
+    sudo pip3 install adafruit-circuitpython-pcf8523
+
+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-pcf8523
+
+
 Usage Notes
 ===========
 
@@ -115,3 +141,61 @@ After the RTC is set, you retrieve the alarm status by reading the
     if rtc.alarm_status:
         print("wake up!")
         rtc.alarm_status = False
+
+Contributing
+============
+
+Contributions are welcome! Please read our `Code of Conduct
+<https://github.com/adafruit/Adafruit_CircuitPython_PCF8523/blob/master/CODE_OF_CONDUCT.md>`_
+before contributing to help this project stay welcoming.
+
+Building locally
+================
+
+Zip release files
+-----------------
+
+To build this library locally you'll need to install the
+`circuitpython-build-tools <https://github.com/adafruit/circuitpython-build-tools>`_ package.
+
+.. code-block:: shell
+
+    python3 -m venv .env
+    source .env/bin/activate
+    pip install circuitpython-build-tools
+
+Once installed, make sure you are in the virtual environment:
+
+.. code-block:: shell
+
+    source .env/bin/activate
+
+Then run the build:
+
+.. code-block:: shell
+
+    circuitpython-build-bundles --filename_prefix adafruit-circuitpython-pcf8523 --library_location .
+
+Sphinx documentation
+-----------------------
+
+Sphinx is used to build the documentation based on rST files and comments in the code. First,
+install dependencies (feel free to reuse the virtual environment from above):
+
+.. code-block:: shell
+
+    python3 -m venv .env
+    source .env/bin/activate
+    pip install Sphinx sphinx-rtd-theme
+
+Now, once you have the virtual environment activated:
+
+.. code-block:: shell
+
+    cd docs
+    sphinx-build -E -W -b html . _build/html
+
+This will output the documentation to ``docs/_build/html``. Open the index.html in your browser to
+view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to
+locally verify it will pass.
+

setup.py

@@ -34,7 +34,7 @@
     author='Adafruit Industries',
     author_email='[email protected]',
 
-    install_requires=['adafruit-circuitpython-register', 'adafruit-circuitpython-busdevice'],
+    install_requires=['Adafruit-Blinka', 'adafruit-circuitpython-register', 'adafruit-circuitpython-busdevice'],
 
     # Choose your license
     license='MIT',