If a repository has no license, then all rights are reserved and it is not Open Source or Free. You cannot modify or redistribute this code without explicit permission from the copyright holder.
It would be great to add an appropriate LICENSE to this repository so that others can re-use the code, if you want to allow that, or to clarify explicitly if you want to reserve all rights.
Hello,
I have no legal background, but according to currently according to this discussion: https://opensource.stackexchange.com/questions/1720/what-can-i-assume-if-a-publicly-published-project-has-no-license,
It would be great to add an appropriate LICENSE to this repository so that others can re-use the code, if you want to allow that, or to clarify explicitly if you want to reserve all rights.