Add files needed to build the docs on readthedocs.io

https://docs.readthedocs.io/en/stable/tutorial/index.html

Author: fedelibre

.readthedocs.yaml

@@ -0,0 +1,17 @@
+version: 2
+
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.8"
+
+python:
+  install:
+    - requirements: doc/requirements.txt
+    # Install our python package before building the docs
+    - method: pip
+      path: .
+
+sphinx:
+  configuration: doc/conf.py
+  fail_on_warning: true

doc/requirements.txt

@@ -0,0 +1,2 @@
+Sphinx==8.1.3
+sphinx-rtd-theme==3.0.2