add instructions to README

Setup/README.md

 # Setup and installation instructions
-The setup constists of cloning this repository, installing `Fenics`, installing a few python modules that are not shipped with the standard distributions and hack away. 
+The setup constists of cloning this repository, installing `docker` and `Fenics`,
+installing a few python modules that are not shipped with the standard
+distributions and hack away.
+This code assumes that you run Linux. It has not been tested on Windows.
+It has been tested on `Debian Buster` and `Archlinux`.
+
+## Install docker
+First, install `docker`, add yourelf to the `docker` group and run the
+docker daemon. This may vary from distribution
+to distribution. On Archlinux you can run
+
+    sudo pacman -S docker
+
+Check the name of the package for your distribution and the documentation of your
+package manager to see how to install docker in your case.
+On `systemd`-based systems the daemon is started by running
+
+    sudo systemctl start docker
+
+in the command line.
+
+Note: If you don't have admistrative rights on your system, ask your systemadmin
+to perform these steps for you. The user that wants to run `docker` needs to
+be in the docker group. If you have added yourself to the docker group, don't
+forget to log out and back in again. A reboot might be required, so if in doubt,
+do that.
 
 ## Manual how to set up latest fenix image in Docker
 Pull the latest `Fenics` Docker image
 
     docker pull quay.io/fenicsproject/stable:latest
 
-This code as been tested on the latest docker version, which is as of October 2020 `Fenics 2019`. The above explains how to pull the latest `Fenics` docker image. Drastic changes to Fenics are envisioned for the next release, notably abandoning the mesh tool `mshr` which this code heavily relies on. Therefore, before even starting, check on the `Fenics` [website](https://fenicsproject.org/download/) if another version of has come out. 
-If yes, you are free to check whether or not this code still works under the latest version, but things might have broken. 
-In that case, the code needs to be adapted first. 
-Alternatively, look on [the release cite](https://quay.io/repository/fenicsproject/stable?tab=tags) for the latest 2019 tag and pull that image. 
-So assuming `2019.1.0` was the latest tag, you would run 
+This code as been tested on the latest docker version, which is as of October 2020 `Fenics 2019`. The above explains how to pull the latest `Fenics` docker image. Drastic changes to Fenics are envisioned for the next release, notably abandoning the mesh tool `mshr` which this code heavily relies on. Therefore, before even starting, check on the `Fenics` [website](https://fenicsproject.org/download/) if another version of `Fenics` has come out.
+If yes, you are free to check whether or not this code still works under the latest version, but things might have broken.
+In that case, the code needs to be adapted first.
+Alternatively, look on [the release cite](https://quay.io/repository/fenicsproject/stable?tab=tags) for the latest 2019 tag and pull the 2019 image.
+So assuming `2019.1.0` was the latest tag for the 2019 version, you would run
 
     docker pull quay.io/fenicsproject/stable:2019.1.0
 
+
 ## Create docker container named LDD-TPR with graphical display, share folder `pwd`
+Move into the folder in which you cloned this directory and run
 
-    docker run --dns=129.69.252.252 -it --env HOST_UID=$(id -u $USER) --env HOST_GID=$(id -g $USER) --env DISPLAY=unix$DISPLAY --device /dev/dri --volume /tmp/.X11-unix:/tmp/.X11-unix:rw --volume $(pwd):/home/fenics/shared --name LDD-TPR-fenics2019 quay.io/fenicsproject/stable:latest /bin/bash 
+    docker run --dns=129.69.252.252 -it --env HOST_UID=$(id -u $USER) --env HOST_GID=$(id -g $USER) --env DISPLAY=unix$DISPLAY --device /dev/dri --volume /tmp/.X11-unix:/tmp/.X11-unix:rw --volume $(pwd):/home/fenics/shared --name LDD-TPR-fenics2019 quay.io/fenicsproject/stable:latest /bin/bash
 
+This will setup your current folder as shared directory for the `Fenics` docker
+image.
+Note: If you pulled a version of docker with a fixed tag, you need to adapt
+the line `quay.io/fenicsproject/stable:latest` in the above to
+`quay.io/fenicsproject/stable:2019.1.0`.
 
 If you want the container do be automatically deleted after exiting add `--rm` option.
 
@@ -31,7 +63,29 @@ If you have trouble with internet connection inside the container use
 
     docker start LDD-TPR & docker exec -ti -u fenics LDD-TPR /bin/bash -l
 
+you should see a message like the following
+```
+# FEniCS stable version image
+
+Welcome to FEniCS/stable!
 
+This image provides a full-featured and optimized build of the stable
+release of FEniCS.
+
+To help you get started this image contains a number of demo
+programs. Explore the demos by entering the 'demo' directory, for
+example:
+
+    cd ~/demo/python/documented/poisson
+    python3 demo_poisson.py
+```
+Tip: This command should be stored as a script or alias to not have to remember it.
+You should see a welcome message greeting you
+
+It is good practice to update the system in your `docker image` so run
+
+    sudo apt-get update && sudo apt-get upgrade
+    
 ## Usefull docker commands
 
 List all docker container
@@ -68,14 +122,14 @@ Remove image
 
 **Solution**
 
-1. If the package is not found first `apt-get update` and then try again. If there is no connection 
+1. If the package is not found first `apt-get update` and then try again. If there is no connection
 check your dns settings.
 
 2. In the container, execute once the script `Rechtesetup/setpermissions.sh` to gain write access in `/home/fenics/shared`
-	
+
         cd /home/fenics/shared/Rechtesetup & sudo ./setpermissions.sh
 
-## Nützliche FEniCS Links 
+## Nützliche FEniCS Links
 
 
 - Forum, viele Fragen wurden evtl. schon gestellt, bzw. können ggf. gestellt werden:
@@ -91,6 +145,3 @@ check your dns settings.
 - Fenics git wenn man wirklich mal in die source files schauen möchte:
 
     https://bitbucket.org/fenics-project/
-
-
-