Make the library a java module

[MrKuip]

Gradle (and eclipse) cannot work out of the box with this library if you have a module project.
Please add a module-info.java

[headius]

Short term you could add an Automatic-Module-Name to the META-INF, but modularizing this wouldn't be difficult. Modularizing it and still support Java 8 is a bit trickier though.