Add readthedocs config file

.github/workflows/ci.yml

@@ -48,7 +48,7 @@ jobs:
       - name: setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.x"
+          python-version: "3.10"
       - name: check docs
         run: python setup.py build_sphinx
 

.readthedocs.yaml

@@ -0,0 +1,21 @@
+# .readthedocs.yaml
+# 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: "3.10"
+
+sphinx:
+  configuration: docs/conf.py
+
+
+python:
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs