Add https://github.com/xdev-software/chartjs-java-model

[melloware]

Awesome Contribution Checklist:

• [x] I have read, and re-read the Contributing Guidelines
• [x] I have searched to ensure the suggested item doesn't exist on this list
• [x] This PR contains only one item

Please Describe Your Addition

There is a version 4 Java Library that was not listed on the legacy 2.x Java library