Installing a third party library to Maven is an easy task. The maven-install-plugin provides a goal to accomplish it easily. You put the library into your local repository by using the following command:
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id>
-DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>
If the library was built with Maven you need the file location argument, only. See the following example:
mvn install:install-file -Dfile=<path-to-file>