License
I would like to build and enhance this but I cannot publish any changes as this project does not have a license. Thus you have not given permission for the code to be reused. See GitHub's licencing page https://help.github.com/en/github/creating-cloning-and-archiving-repositories/licensing-a-repository#disclaimer
without a license, the default copyright laws apply, meaning that you retain all rights to your source code and no one may reproduce, distribute, or create derivative works from your work.
Please choose a license see Github's https://choosealicense.com/
+1, the README clearly indicates that this is a library you intend for others to use, but the unclear licensing status hinders this.