Add config file and badge for readthedocs

.readthedocs.yml

@@ -0,0 +1,21 @@
+# .readthedocs.yml
+# 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:
+  builder: html
+  configuration: package/doc/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: all
+
+# Optionally set the version of Python and requirements
+# required to build your docs
+python:
+  version: 3
+  install:
+    - requirements: requirements-release.txt

README.md

@@ -5,6 +5,7 @@ A fat-free DIY Python plugin management toolkit.
 
 [![BSD license](https://img.shields.io/pypi/l/yapsy.svg)](./package/LICENSE.txt)
 [![PyPI version](http://img.shields.io/pypi/v/Yapsy.svg)](https://pypi.python.org/pypi/yapsy)
+[![Documentation Status](https://readthedocs.org/projects/yapsy/badge/?version=latest)](https://yapsy.readthedocs.io/en/latest/?badge=latest)
 
 Get more info on: 
   * [the detailed description](./package/README.txt)