Add module-info.java file

[Sineaggi]

To run the library in a modular world, on the module path.

[jamesward]

I'd love a pull request for this since I'm not familiar with the best way to do it.

[Sineaggi]

The easiest way is to bump java version to >8 (if possible) then add a module-info and verify all the tests still pass.

If 8 compatibility is required, then adding one via the moditect maven plugin might be the easiest route. https://github.com/moditect/moditect#generating-module-infojava-descriptors

[Sineaggi]

Also it looks like the project depends on jsr305 annotations, which causes split packages with javax.annotation under java 9+. https://nipafx.dev/jsr-305-java-9/

[Sineaggi]

[WARNING] * Required filename-based automodules detected: [jsr305-3.0.2.jar]. Please don't publish this project to a public artifact repository! *

Warning from maven's compiler plugin.