Docs fail to build because readthedocs config is missing

[cortadocodes]

Bug report

What is the current behavior?

The docs fail to build as there is no readthedocs config file.

What is the expected behavior?

The docs build.

[thclark]

Should contain somehting like:

# Read the Docs configuration file
# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details

# Required
version: 2

# Set the OS, Python version and other tools you might need
build:
  os: ubuntu-22.04
  tools:
    python: '3.12'
    # You can also specify other tool versions:
    # nodejs: "19"
    # rust: "1.64"
    # golang: "1.19"

# Build documentation in the "docs/" directory with Sphinx
sphinx:
  configuration: docs/source/conf.py

# Optionally build your docs in additional formats such as PDF and ePub
# formats:
#    - pdf
#    - epub

# Optional but recommended, declare the Python requirements required
# to build your documentation
# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
python:
  install:
    - requirements: docs/requirements.txt