MT#57728 Docs: add .readthedocs.yml file

Add the root RTD file required for
a proper building of the documentation.

Change-Id: If9b2d2d86491e31528ffbcc6108f744a58114c0f

.readthedocs.yaml

@@ -0,0 +1,14 @@
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
+
+sphinx:
+   configuration: docs/conf.py
+
+python:
+   install:
+   - requirements: docs/requirements.txt
+