Update README.md

Author: rordi

README.md

@@ -1,6 +1,6 @@
 # rordi/docker-mailcatcher
 
-A lightweight Docker image with mailcatcher (just 64 MB compressed / 187 MB uncompressed)
+A lightweight Docker image with [mailcatcher](https://mailcatcher.me/) (just 64 MB compressed / 187 MB uncompressed).
 
 You can pull the image from the [Docker registry](https://hub.docker.com/r/rordi/docker-mailcatcher/) and run with:
 
@@ -15,3 +15,7 @@ To install the image into your network with docker-compose, simply add the follo
         - 1080:1080
       networks:
        - yournetworkid
+
+Finally, confiugure your application to use the Mailcatcher SMTP on port 1025, e.g. host: mailcatcher:1025. You can access the catched emails on the web GUI via http://localhost:1080. 
+
+Please refer to the [mailcatcher website](https://mailcatcher.me/) for more information.