Add new required file '.readthedocs.yaml' for rtd

https://blog.readthedocs.com/migrate-configuration-v2/

Author: jquast

Diff for: .readthedocs.yaml

@@ -0,0 +1,11 @@
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+version: 2
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+sphinx:
+  configuration: docs/conf.py
+python:
+  install:
+   - requirements: docs/requirements.txt