Merge pull request #556 from LilithHafner/patch-1

Add install link to README.md

README.md

@@ -1,6 +1,7 @@
 # YaCy
 [![Gitter](https://badges.gitter.im/yacy/yacy_search_server.svg)](https://gitter.im/yacy/yacy_search_server?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://travis-ci.org/yacy/yacy_search_server.svg?branch=master)](https://travis-ci.com/yacy/yacy_search_server)
+[![Install Link](https://img.shields.io/badge/install-stable-blue.svg)](https://yacy.net/download_installation/)
 
 [![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)