initial readthedocs config

.readthedocs.yaml

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+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+
+sphinx:
+   configuration: docs/conf.py
+
+# Optionally declare the Python requirements required to build your docs
+#python:
+#   install:
+#   - requirements: docs/requirements.txt