Add build config for read the docs (require Python >= 3.8)

Author: timsavage

.readthedocs.yaml

@@ -0,0 +1,12 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3"