docs: add Read the Docs .readthedocs.md

.readthedocs.yaml

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+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+mkdocs:
+  configuration: mkdocs.yml
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+   version: "3.7"
+   install:
+   - requirements: docs/requirements.txt

docs/requirements.txt

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+# requirements.txt
+mkdocs==1.0.4