Updated README.md

Author: ppanopticon

README.md

@@ -7,18 +7,24 @@ This is an Open API based RESTful service that generates and reads Swiss QR code
 - Scan a Swiss QR Code payment slip from an image or a PDF and parse its content.
 - Generate a Swiss QR code payment slip in PNG, PDF or SVG format.
 
-The API is documented using the Open API standard, which -- once the service is running - you find under ``/swagger-docs``. There is also a very simple UI under ``/swagger-ui``. 
+The API is documented using the Open API standard, which - once the service is running - you find under ``/swagger-docs``. There is also a very simple UI under ``/swagger-ui``. 
 
 ## Building and running Swiss QR API
-Swiss QR API runs on the JVM and was written in Kotlin. In order to build Swiss QR API you will require *Java 11* or higher. The project comes with an integrated Gradle wrapper. Once you have checked out the source you can run it using ``./gradlew run`` or build it using ``./gradlew distTar`` or ``./gradlew distZip``.
+Swiss QR API runs on the JVM and was written in Kotlin. In order to build Swiss QR API you will require *Java JDK 21* or higher. The project comes with an integrated Gradle wrapper. Once you have checked out the source you can run it from within the project directory using ``./gradlew run`` or build it using ``./gradlew distTar`` or ``./gradlew distZip``.
 
-Make sure you provide a path to a valid ``config.json`` file as program argument. Currently, you can only influence the port under which the Swiss QR API will run (8081 by default).
+Make sure you provide a path to a valid ``config.json`` file as program argument (see example file in project directory).
+
+**Important:** The ``config.json`` can be used to configure the server port of the service (8081 by default). Furthermore, you can change / add API keys that can be used to interact with the service. It is recommended to change the default key for security reasons.
+
+## Dockerfile
+
+The project also comes with a Dockerfile, which can be used instead. You can build the Docker image from within the project directory using ```docker build .``` and run it using ```docker run -p 8081:8081 <image-id>```. Again, make sure you adjust the ``config.json`` file to your needs.
 
 ## Credits
-Swiss QR API relies on a bunch of great open source- libraries. The ones I would like to mention here are:
+Swiss QR API relies on a bunch of great open source-libraries. The ones I would like to mention here are:
 
-- [SwissQRBill](https://github.com/manuelbl/SwissQRBill): An Java library to generate and decode Swiss QR bills .
+- [SwissQRBill](https://github.com/manuelbl/SwissQRBill): An Java library to generate and decode Swiss QR bills.
 - [Javalin](https://javalin.io/): An web server framework for Java and Kotlin.
-- [BoofCV](https://boofcv.org/): A computer vision framework for Java
+- [BoofCV](https://boofcv.org/): An amazing computer vision framework for Java.
 
 Thanks a lot to the great work of all people involved in these libraries (and of course all the others, that did not get a mention here)!