Update README.md

Added some information on installation steps.

README.md

@@ -1,2 +1,30 @@
 # sap-nw-abap-docker
 SAP NetWeaver ABAP Developer Edition in Docker
+
+# Installation
+
+A detailed blog on how to get this image and container up and running can be found on my blog: [DOCKERFILE FOR SAP NETWEAVER ABAP 7.5X DEVELOPER EDITION](https://www.itsfullofstars.de/2017/09/dockerfile-for-sap-netweaver-abap-7-5x-developer-edition/)
+
+## Short version
+
+1. Download your version of [SAP NetWeaver ABAP 7.5x Developer Edition from SAP](https://tools.hana.ondemand.com/#abap). The files are compressed (RAR). Un-compress them into a folder named NW751. The folder must be at the same location where your Dockerfile is.
+
+2. Build the Docker image
+
+```sh
+docker build -t nwabap .
+```
+
+3. Start container
+
+```sh
+docker run -P -h vhcalnplci --name nwabap751 -it nwabap:latest /bin/bash
+```
+
+4. Start NetWeaver installation
+
+```sh
+run.sh
+```
+
+5. Done. NetWeaver ABAP is installed and ready to be used. Users, credentials, etc can be found in the fie readme.html shipped with the NetWeaver ABAP RAR files.