Added "Launching the tool with docker"

Launching-the-tool-with-docker.md

@@ -0,0 +1,14 @@
+This is the most simple way to get this tool up and running. This method downloads the newest image from docker hub.
+
+When launching the first time, a docker container must be setup correctly. To give docker access to the host X11, we forward the X11 sockets.
+
+```
+docker run \
+   -e DISPLAY=$DISPLAY \
+   -v /tmp/.X11-unix:/tmp/.X11-unix \
+   --net host \
+   --name zeiterfassung \
+   0xfeedc0de64/qtzeiterfassung
+```
+
+All further launches can be done with `docker start zeiterfassung`