of files in most projects use this mode. If in doubt, this is
what you want.
* `100755` or `755`: A normal, but executable, file.
-* `140000`: A symlink, the content of the file will be the link target.
+* `120000`: A symlink, the content of the file will be the link target.
In both formats `<path>` is the complete path of the file to be added
(if not already existing) or modified (if already existing).