adden 'install' section to README

Author: fquirin

README.md

@@ -1,5 +1,8 @@
 # sepia-extensions
 Extensions (the "E" in SEPIA) are plugins and smart services that enhance SEPIA's capabilities.
 
+## Install Extensions
+Via the 'Code-UI' page of the [SEPIA Control-HUB](https://github.com/SEPIA-Framework/sepia-admin-tools/tree/master/admin-web-tools) you can download, edit and deploy plugins and services included in this repository directly to your own server.
+
 ## Contribute
 Feel free to clone this repository, build your own extension and create a pull request to submit it. We will review your submission and consider adding it to the master branch.