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Explicit repository excludes

If you don't want to create a .gitignore file to share with others, you can create rules that are not committed with the repository. You can use this technique for locally-generated files that you don't expect other users to generate, such as files created by your editor.

Use your favorite text editor to open the file called .git/info/exclude within the root of your Git repository. Any rule you add here will not be checked in, and will only ignore files for your local repository.

1. In Terminal, navigate to the location of your Git repository.
2. Using your favorite text editor, open the file `.git/info/exclude

Source: https://help.github.com/articles/ignoring-files/