Add sphinx configuration

.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
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: docs/conf.py
+
+# Optionally build your docs in additional formats such as PDF
+# formats:
+#    - pdf
+
+# Optionally set the version of Python and requirements to build your docs
+python:
+   version: 3.7
+   install:
+      - requirements: requirements-full.txt

requirements-full.txt

@@ -222,3 +222,6 @@ yarl==1.6.3; python_version >= "3.6"
 yfinance==0.1.59
 zipp==3.4.1; python_version < "3.8" and python_version >= "3.6"
 zope.interface==5.4.0; python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.5"
+sphinx==3.5.4
+myst-parser==0.13.7
+sphinx-rtd-theme==0.5.2