Fix #3 add dockerfile

README.md

@@ -16,7 +16,6 @@
 
 **kleinanzeigen-bot** is a console based application to ease publishing of ads to ebay-kleinanzeigen.de.
 
-
 It is a spiritual successor to [AnzeigenOrg/ebayKleinanzeigen](https://github.com/AnzeigenOrg/ebayKleinanzeigen) with the following advantages:
 - supports Microsoft Edge browser (Chromium based)
 - compatible chromedriver is installed automatically
@@ -77,6 +76,52 @@ It is a spiritual successor to [AnzeigenOrg/ebayKleinanzeigen](https://github.co
    python -m kleinanzeigen_bot --help
    ```
 
+### Installation using Docker
+
+1. The following components need to be installed:
+   1. [Docker](https://www.docker.com/)
+   1. [git client](https://git-scm.com/downloads)
+   1. [Bash](https://www.gnu.org/software/bash/) (on Windows e.g. via [Cygwin](https://www.cygwin.com/), [MSys2](https://www.msys2.org/) or git)
+   1. [X11 - X Window System](https://en.wikipedia.org/wiki/X_Window_System) display server (on Windows e.g. https://github.com/P-St/Portable-X-Server/releases/latest)
+
+1. Clone the repo using
+   ```
+   git clone https://github.com/kleinanzeigen-bot/kleinanzeigen-bot/
+   ```
+
+1. Open the cloned directory in a Bash terminal window and navigate to the [docker](docker) subdirectory
+
+1. Execute `bash build-image.sh`
+
+1. Ensure the image is build:
+
+   ```
+   $ docker image ls
+   REPOSITORY                            TAG      IMAGE ID       CREATED       SIZE
+   kleinanzeigen-bot/kleinanzeigen-bot   latest   c31fd256eeea   1 minute ago  590MB
+   python                                3-slim   2052f0475488   5 days ago    123MB
+   ```
+
+**Running the docker image:**
+1. Ensure the X11 Server is running
+
+1. Run the docker image:
+
+   ```bash
+   X11_DISPLAY=192.168.50.34:0.0 # replace with IP address of workstation where X11 server is running
+
+   DATA_DIR=/var/opt/data/kleinanzeigen-bot # path to config
+
+   # /mnt/data is the container's default working directory
+   docker run --rm --interactive --tty \
+     --shm-size=256m \
+     -e DISPLAY=$X11_DISPLAY \
+     -v $DATA_DIR:/mnt/data \
+     kleinanzeigen-bot/kleinanzeigen-bot \
+     --help
+   ```
+
+
 ## <a name="usage"></a>Usage
 
 ```yaml