add config readthedocs

Author: aloctavodia

.readthedocs.yaml

@@ -0,0 +1,15 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+version: 2
+
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+
+python:
+   install:
+   - requirements: requirements-docs.txt
+   - requirements: requirements.txt
+   - method: pip
+     path: .