Fix missing files when creating new project

[ziadoz]

The readme composer create-project command doesn't appear to include every file I would expect:

I believe the issue is the .gitattributes file has export-ignore declared for the missing files, so along with --prefer-dist, the files aren't exported to the archive.

I changed the command to --prefer-source, and --remove-vcs (to remove .git), and the results are what I expect: