Update readme

README.md

@@ -16,17 +16,43 @@ provides a comprehensive and intuitive user interface for the core functionalite
 
 ## More information
 There is a [Conda repository for openPrimeR available](https://anaconda.org/bioconda/bioconductor-openprimer/badges).
-A [Docker container](https://hub.docker.com/r/mdoering88/openprimer/) for running openPrimeR/openPrimeRui is available. Usage:
+For more information on how to install the third-party dependencies for openPrimeR, we refer to the corresponding [user-space repository](https://github.com/matdoering/openPrimeR-User), which provides installation routines.
+
+### Docker Instructions
+
+Our docker image is available at [dockerhub](https://hub.docker.com/r/mdoering88/openprimer/). In order to use the docker image, you need to [install docker](https://www.docker.com/) on your system and activate the docker daemon. 
+
+After logging in with your docker account, in a console, enter 
+
+>**docker pull mdoering88/openprimer**
+
+to retrieve the latest docker image of the tool. Since the image is quite large the download (~4 GB) may take some time, especially if your internet connection is not very fast.
+
+To run the image, enter
+
+>**docker run -p 3838:3838 --rm mdoering88/openprimer**
+
+After this, the tool is available by accessing **localhost:3838** in your web browser.
+
+In case you want to have more control of the image you are running or you want to study the output of the tool, you can execute
+
+>**docker run --rm -p 3838:3838 -v /tmp/logs/:/var/log/shiny-server/ mdoering88/openprimer:latest**
+
+With this call, the tool's log file is stored in the */tmp/logs/* folder on your system with a filename starting with *shiny-shiny*). During the session, you can use 
+
+>**tail -f shiny-shiny-X.txt**
+
+to retrieve the current status messages. 
+
+Moreover, in the above call to Docker, we have specified a tag, namely *:latest*, which means that we have started the most recent version of the tool. In case that no tag is provided, the latest available Docker image is used.
+
+You can also work with the openPrimeR API through the container by executing
 
 ```
-docker pull mdoering88/openprimer
-# for openPrimeRui
-docker run -rm -p 3838:3838 mdoering88/openprimer
-# to work with openPrimeR via the CLI
 docker run -rm -it mdoering88/openprimer bash
 ```
 
-For more information on how to install openPrimeR, we refer to the corresponding [user-space repository](https://github.com/matdoering/openPrimeR-User), which provides installation routines.
+and then starting an R session and loading the `openPrimeR` package.
 
 ## Changelog