Add link to doc

README.md

@@ -1,6 +1,6 @@
 # ![pydamage logo](docs/img/logo.png)
 
-[![pydamage CI](https://github.com/maxibor/pydamage/workflows/pydamage_ci/badge.svg)](https://github.com/maxibor/pydamage/actions)
+[![pydamage CI](https://github.com/maxibor/pydamage/workflows/pydamage_ci/badge.svg)](https://github.com/maxibor/pydamage/actions) [![Documentation Status](https://readthedocs.org/projects/pydamage/badge/?version=latest)](https://pydamage.readthedocs.io/en/latest/?badge=latest)
 
 Pydamage, is a Python software to automate the process of contig damage identification and estimation.
 It uses a process akin to a likelihood ratio test to attempt to discriminate between truly ancient, and modern contigs originating from sample contamination.
@@ -32,6 +32,10 @@ python setup.py install
 pip install git+ssh://git@github.com/maxibor/pydamage.git
 ```
 
+## Documentation
+
+[pydamage.readthedocs.io](https://pydamage.readthedocs.io)
+
 ## Help
 
 ```bash