Add README for JUnit Jupiter module documenting JUnit 5/6 support

[rhusar]

Clarifies that the junit5 module supports both JUnit 5 and JUnit 6 despite the naming convention. Documents JDK requirements for each JUnit version and provides basic usage example.

Resolves: #802

Summary by Sourcery

Document JUnit Jupiter module usage and replace the legacy TODO file with proper README documentation.

Documentation:

• Add a README for the JUnit Jupiter (junit5) module describing JUnit 5 and JUnit 6 support, JDK requirements, and basic usage.
• Remove the obsolete junit5 TODO.txt in favor of the new README.

[sourcery-ai]

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[rhusar]

@jamezp please have a look. not optimal, but better than fending questions about this.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding a reference or link to this new junit5/README.adoc from the root-level README or main documentation index so users can easily discover the clarified JUnit 5/6 support information.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a reference or link to this new junit5/README.adoc from the root-level README or main documentation index so users can easily discover the clarified JUnit 5/6 support information.

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[jamezp]

Thank you @rhusar. This makes sense to me.

[jamezp]

Now that I think about it, and this would not block this, I wonder if it's worth moving this to junit-jupiter and doing a relocation for arquillian-junit-5-*.

[rhusar]

Now that I think about it, and this would not block this, I wonder if it's worth moving this to junit-jupiter and doing a relocation for arquillian-junit-5-*.

That's a great idea, I always thought of relocation in the scope of groupIds, never artefactIds – opened #805