add readthedocs yaml and req

.readthedocs.yaml

@@ -0,0 +1,19 @@
+# Read the Docs configuration file
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "=3.10"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: docs/source/conf.py
+
+# Python requirements required build your documentation
+python:
+   install:
+   - requirements: docs/requirements.txt

docs/requirements.txt

@@ -0,0 +1,3 @@
+.
+sphinx_rtd_theme==2.0.0
+nbsphinx==0.9.3