fix(main): make examples runnable

[cshamrick]

This change updates examples/pom.xml and adds a readme with instructions for how to run the examples.

[gemini-code-assist]

Summary of Changes

Hello @cshamrick, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the usability of the OpenTDF Java SDK examples by making them directly runnable and providing comprehensive documentation. The changes streamline the process for developers to interact with and learn from the example code, enhancing the overall developer experience.

Highlights

• Runnable Examples: The examples for the OpenTDF Java SDK are now runnable, making it easier for users to test and understand the SDK's functionalities.
• New README.md: A new examples/README.md file has been added, providing clear instructions on how to execute each example using the exec-maven-plugin.
• Maven Configuration Update: The examples/pom.xml has been updated to configure the exec-maven-plugin with individual execution IDs for each example, allowing them to be run by name (e.g., mvn exec:java@EncryptExample).

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[gemini-code-assist]

Code Review

This pull request makes the Java SDK examples runnable by updating the examples/pom.xml to configure the exec-maven-plugin for each example, and by adding a README.md with clear instructions. The changes are well-executed and achieve the goal. My review includes one suggestion to enhance the new documentation for better usability.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

X-Test Failure Report

✅ go-v0.4.34
✅ js-main
✅ java-main

[github-actions]

X-Test Failure Report

✅ go-v0.4.34
✅ js-main
✅ java-main
✅ js-v0.4.34

[github-actions]

X-Test Results

✅ go-v0.4.34
✅ js-main
✅ java-main
✅ js-v0.4.34
✅ java-v0.4.34
✅ go-main

[mkleene]

This is a really good idea!