Added config file for readthedocs

.readthedocs.yaml

+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+sphinx:
+  configuration: hpvm/docs/conf.py
+python:
+  version: 3.6
+  install:
+    - requirements: hpvm/docs/requirements.txt

hpvm/docs/README.md

@@ -4,10 +4,10 @@ We use Sphinx for generating the API and reference documentation.
 
 ## Instructions
 
-Install the following Python packages needed to build the documentation by entering:
+Install Sphinx needed to build the documentation by entering:
 
 ```bash
-pip3 install sphinx sphinx-autodoc-typehints sphinx-rtd-theme numpydoc
+pip3 install -r requirements.txt
 ```
 
 To build the HTML documentation, enter::

hpvm/docs/requirements.txt

+sphinx>=3.5
+sphinx-autodoc-typehints>=1.11
+sphinx-rtd-theme>=0.5
+numpydoc>=1.1
\ No newline at end of file