removed COMPAS_Doc.pdf, added link in README

Author: Reinhold Willcox

README.md

@@ -4,14 +4,16 @@
 
 # Compact Object Mergers: Population Astrophysics & Statistics
 
+[![Documentation](https://img.shields.io/badge/Documentation-latest-orange.svg?style=flat)](https://github.com/TeamCOMPAS/COMPAS/blob/Documentation/COMPAS_Documentation.pdf)
+
 [//]: ## (Outline features)
 COMPAS is a publicly available rapid binary population synthesis code (https://compas.science/) that is designed so that evolution prescriptions and model parameters are easily 
 adjustable.  COMPAS draws properties for a binary star system from a set of initial distributions, and evolves it from zero-age main sequence to the end of its life as two compact 
 remnants.  It has been used for inference from observations of gravitational-wave mergers, Galactic neutron stars, X-ray binaries, and luminous red novae.
 
 ## Documentation
 [Getting started](./docs/getting_started.md)  
-[Specifications](./docs/COMPAS_Doc.pdf)  
+[Specifications](https://github.com/TeamCOMPAS/COMPAS/blob/Documentation/COMPAS_Documentation.pdf)  
 [Post-processing](./postProcessing/README.txt)  
 [Running COMPAS inside a Docker container](./docs/docker.md)