Add a docs RTD file, add some badges

.readthedocs.yaml

@@ -13,8 +13,7 @@ build:
 sphinx:
   configuration: docs/conf.py
 
-# Optional but recommended, declare the Python requirements required
 # See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
-#    install:
-#    - requirements: docs/requirements.txt
+python:
+  install:
+  - requirements: docs/requirements.txt

README.md

@@ -4,10 +4,13 @@ This is a collection of solar angle and related calculations.
 ## Source
 These are based mostly on Chapter 6 of _Heating, Ventilation, and Air Conditioning_ by Faye McQuistion and Jerald Parker, 3rd Edition, 1988, with minor pieces from other versions of the same book.  Other sources are noted in the source.  All the functions were written from scratch by me.
 
+## Releases [![PyPIRelease](https://github.com/Myoldmopar/SolarCalculations/actions/workflows/release.yml/badge.svg)](https://github.com/Myoldmopar/SolarCalculations/actions/workflows/release.yml)  ![PyPI - Version](https://img.shields.io/pypi/v/solar-angles)
+The latest release can be found on the [Releases](https://github.com/Myoldmopar/SolarCalculations/releases/latest) page.  All packages are distributed through [PyPi](https://pypi.org/project/solar-angles/).
+
 ## Documentation [![](https://readthedocs.org/projects/solar-calculations/badge/?version=latest)](http://solar-calculations.readthedocs.org/en/latest/)
 Documentation is hosted on [ReadTheDocs](http://solar-calculations.readthedocs.org/en/latest/).  The functions are all documented with Markdown syntax doc strings in a way that Sphinx can interpret them.  To build the documentation, enter the docs/ subdirectory and execute `make html`; then open `/docs/_build/html/index.html` to see the documentation.
 
-## Testing [![](https://travis-ci.org/Myoldmopar/SolarCalculations.svg?branch=master)](https://travis-ci.org/Myoldmopar/SolarCalculations)
+## Testing
 The source is tested using the python unittest framework.  To execute all the unit tests, just execute the test file (since it calls `unittest.main()`): `python test/test_solar.py`.  The tests are also executed by [Travis CI](https://travis-ci.org/Myoldmopar/SolarCalculations).
 
 ## Validation

docs/requirements.txt

@@ -0,0 +1,2 @@
+sphinx
+sphinx-rtd-theme

requirements.txt

@@ -9,6 +9,7 @@ flake8
 
 # for documentation
 sphinx
+sphinx-rtd-theme
 
 # for packaging
 wheel