Add ReadTheDocs configuration file

Author: ctr26

.readthedocs.yaml

@@ -1,6 +1,11 @@
 # .readthedocs.yaml
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.8"
+
 # Tell RTD to use MkDocs and point at your config
 mkdocs:
   configuration: mkdocs.yaml