Adds Read The Docs integration

docs/index.rst

+.. a documentation master file, created by
+   sphinx-quickstart on Sun May 29 21:31:22 2022.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to a's documentation!
+=============================
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`