I want to create a game with my pal but i dont know how to share the project with him or if it is possible :v
Yep, you can check these tutorials below:
(25) How to publish your own video game with Core for sharing and testing - YouTube
(25) Building Games As A Team Using Core Editor (Github Tutorial) - YouTube
So there's GitHub: GitHub and Core - Core Documentation
And if you just want to be able to build stuff that one person integrates into a single project, Templates (Redirecting...) let you package models, scripts, whole systems if you want. You can share on Community Content to share with everyone, or export them to send them to someone in particular.