try

docs/index.rst

@@ -0,0 +1,21 @@
+.. pecg documentation master file, created by
+   sphinx-quickstart on Thu Sep 30 22:13:23 2021.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+.. include:: README.rst
+
+.. toctree::
+   :maxdepth: 4
+   :caption: PECG API REFERENCE:
+
+   pecg
+
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`