Upload the sources of your external class homework into the fork (clone, commit, push).
Only the interface and the implementation class is needed, the test model must not be uploaded.
The package name should be: hu.elte.txtuml.stdlib.<the original Java package name without 'java'>
For example, if the original Java package name is java.util, then the required package name should be hu.elte.txtuml.stdlib.util.
Make sure that you have Javadoc documentation for the interface and for all its methods. These can be based on the Javadoc documentation of the original Java library and modified as needed.
Create a pull request to the repository txtUML-stdlib.