Currently, your game isn't exported in a format that appears playable. You will need to export it as a binary for windows/linux/macOS from what I can tell from the json file you've got here. Using gdevelop 5, this means exporting it for windows/linux/macOS and then uploading those files. But, what you've got made here is a start!
As far as hosting it goes, dropbox or google drive are both fairly accessible.