Add a JAR without dependencies to allow other logging implementations

[Elvynia]

The only JAR available is packaging log4J implementation and it is forcing to use log4j as active logger in the projects using this.

I've been using this JAR with Spring Boot v2.2.5.RELEASE successfuly. I wanted to use current version 3.0.6 which benefits from way more recent java version and API but... I keep having exception saying I have to remove log4j logger factories from classpath if I want to use Logback.
I finally rolled back to v2.2.5.RELEASE to keep working.

This would not be a problem if it were published on maven repository (#19 ) I guess.

Please would it be ok to put a JAR without depdendencies in your repo ?