Update documentation to include code snippet examples for using the validator as a library

[emmambd]

Describe the problem

Now that we're publishing the validator on Maven as a library (#1588), the community needs examples for how to implement it this way.

Suggest a fix or an alternative

• Provide code snippet examples for how to use the validator as a library in the README.
• Create example project to showcase how to integrate Maven library

[davidgamez]

Tasks:

• Create an example project with minimum functionality
• Create documentation and code snippet.
• Share documentation