Adding .readthedocs.yaml
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
new file mode 100644
index 0000000..0c7e331
--- /dev/null
+++ b/.readthedocs.yaml
@@ -0,0 +1,20 @@
+# .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: "2.7"
+
+mkdocs:
+  configuration: mkdocs.yml
+
+# Optionally declare the Python requirements required to build your docs
+# python:
+#    install:
+#    - requirements: requirements.txt