You should only upload the assets folder and if you make any changes to the project files in the main folder, you can add those files. Also, make sure you have Git Large File Storage (LFS) installed, or some of your assets, like images and sounds, won't get saved to Git.
If you are new to Unity-git workflow, I'm suggesting you to add this .gitignore file that is explicitly for Unity and appropriate git hooks which will facilitate your life with .meta files Unity create for each asset you add.
HI I would love to join your team. My skills are mechanic implementation, scripting and level design. I can do basic models and white room design if needed. add me on discord if you are interested to work with me.
