Add readthedocs config

.readthedocs.yaml

@@ -0,0 +1,15 @@
+version: 2
+
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+
+sphinx:
+   configuration: docs/conf.py
+
+python:
+   install:
+   - requirements: requirements.txt
+   - method: setuptools
+     path: .