add Read the Docs configuration file (#281)

Author: tomplus

.readthedocs.yaml

@@ -0,0 +1,12 @@
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: doc/source/conf.py