docs: add a Tests section to the README

[ryanbarlow97]

Summary

Part of a cross-repository audit against the TF-Minecraft repository norms (README layout per Docs MAINTAINING.md and the other plugin READMEs, POM layout per Docs POM-CONVENTIONS.md).

• README: add the Tests section that other plugin repos with test suites carry, based on the build workflow and pom.xml.

Checks

• README text otherwise unchanged (sections moved verbatim).

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📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Added guidance on Java 21 and plugin prerequisites, how to obtain required build inputs, and how to run the test suite, including its use of JUnit and Mockito without a live Minecraft server.

Walkthrough

The README adds instructions for preparing dependencies and private build inputs. It specifies Java 21 and the adjacent TLibs checkout, gives the Maven command, and describes the test frameworks and server requirement.

Changes

Test-running documentation

Layer / File(s)	Summary
Document test execution README.md	The README explains how to install pinned plugin dependencies and prepare private build inputs with a GH_TOKEN that has Contents read access. It specifies Java 21, an adjacent TLibs checkout, and mvn clean verify. It notes that CI uses DEPS_TOKEN and that JUnit and Mockito tests do not require a live Minecraft server.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 1fd96

The new test instructions are consistent with the build setup; no merge-blocking issue remains.

Architecture Summary

Architecture risk: 🔵 Low · up to 3b7e1

The change affects 1 system.

Changed systems: README.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — README.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in README.md: Added test-running documentation: with Java 21 and pinned plugin dependencies prepared by .github/scripts/prepare-release.sh, run mvn clean verify; tests use JUnit and Mockito and do not require a live Minecraft server.

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @README.md:
- Around line 27-28: Update the README build instructions to document both
dependency setup steps before `mvn clean verify`: set up the pinned shared
plugin dependencies, then run `.github/scripts/prepare-release.sh`. State that
the script requires `GH_TOKEN` with Contents read access to
`TF-Minecraft/ServerAssets`.

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• Plan: Advanced
• Run ID: 654b9513-cc45-4e1e-becf-aec3d7f61526

📥 Commits

Reviewing files that changed from the base of the PR and between 7865869 and 3b7e12c.

📒 Files selected for processing (1)

• README.md

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