No activity/new features

[samukweku]

@oleksiyskononenko the project seems inactive for a while, with no new features added. I would have contributed, but as you have seen from my previous PR, my c++ skills are not good. Anything happening in the background, some inkling of what's happening, if any?

[oleksiyskononenko]

@samukweku I'm now working on several fixes to datatable.models that are not very easy to be addressed. Meanwhile, if you want to work on some beginner C++ task, that's very much appreciated. I don't think you need to close your PR if something goes wrong, we can work step by step to make it work. I propose you re-open your cumsum PR and explain what issues you face, so that I could help. Also, note that you have permissions to create new branches in the datatable repo and forking is not really needed. The issue with forking is that I can't push commits to your PR to help.