Mahmoud Ibrahim

eums folder in the core

1

From my experience, I always need enum files in the core folder I created a PR for it hope it's good to be merged soon

### Please read and mark the following check list before creating a pull request: - [] I read and followed the [CONTRIBUTING.md](https://github.com/akveo/nebular/blob/master/CONTRIBUTING.md) guide. #### Short description of what this resolves:

I think this will be great if we have like a good ref with this cheatsheet to related tasks in various use cases so we make sure every single line...