Xcode 9 Initial Commit所以只添加源文件

I made a new C++ project, then created a repo, and Xcode 9 automatically creates an Inital Commit. All I want to have in the initial commit is "main.cpp". (I managed to get rid of the metadata with Xcode>SourceControl>Git>IgnoredFiles by adding "*.xcodeproj".) However, it added "._main.cpp", which is a garbage file that I don't need.I made a new C++ project, then created a repo,