WIP: improve development env and README #15

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hsh-michaelhoennig wants to merge 1 commits from java-for-gradlew into master

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@ -50,10 +50,13 @@ Everything is tested on _Ubuntu Linux 22.04_ and _MacOS Monterey (12.4)_.
To be able to build and run the Java Spring Boot application, you need the following tools:
- Docker 20.x (on MacOS you also need *Docker Desktop* or similar) or Podman
- git, e.g. via `sudo apt install git`
- A Java Runtime (JRE) at least version 17 to run the gradle wrapper, e.g. via
`sudo apt install openjdk-17-jre-headless`.
(The matching Java JDK for building the application will be automatically installed by Gradle toolchain support.)
- Docker 20.x (on MacOS you also need *Docker Desktop* or similar) or Podman.
- optionally: PostgreSQL Server 15.5-bookworm
(see instructions below to install and run in Docker)
- The matching Java JDK at will be automatically installed by Gradle toolchain support.
- You also might need an IDE (e.g. *IntelliJ IDEA* or *Eclipse* or *VS Code* with *[STS](https://spring.io/tools)* and a GUI Frontend for *PostgreSQL* like *Postbird*.
If you have at least Docker and the Java JDK installed in appropriate versions and in your `PATH`, then you can start like this: