Add example for using Java's source launcher

[sormuras]

Overview

Please review this change to add an example for using Java's source launcher using the org.junit.start module in a compact source file.

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| junit-source-launcher
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| java init/DownloadRequiredModules.java
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Downloading 1 module
org.junit.start <- https://central.sonatype.com/repos
Downloading 5 modules
org.jspecify <- https://repo.maven.apache.org/maven2/
org.apiguardian.api <- https://repo.maven.apache.org/
org.junit.platform.console <- https://central.sonatyp/
org.junit.jupiter <- https://central.sonatype.com/rep
org.junit.platform.launcher <- https://central.sonaty/
Downloading 6 modules
org.junit.jupiter.engine <- https://central.sonatype/.
org.junit.platform.engine <- https://central.sonatype/
org.junit.jupiter.params <- https://central.sonatype/.
org.junit.platform.commons <- https://central.sonatyp/
org.junit.jupiter.api <- https://central.sonatype.com/
org.junit.platform.reporting <- https://central.sonat/
Downloading 2 modules
org.opentest4j <- https://repo.maven.apache.org/maven
org.opentest4j.reporting.tooling.spi <- https://repo/.

List modules of lib directory
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org.jspecify
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    14 modules


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| junit-source-launcher
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| java --module-path lib --add-modules org.junit.start src/HelloTests.java
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╷
└─ JUnit Jupiter ✔
   └─ HelloTests ✔
      └─ stringLength() ✔

Work Items

• Add example with documentation
• Include example in "Build All" program
• Include example module version(s) Updater.java and StagingRepoInjector.java

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