Ignore nameless vim swap files Starting vim with no file name creates a swap file in the form of .swp, .swo etc. Add these files to .gitignore. Bug: None Change-Id: Id9639f626daebc993ccc9ab0a9049a18e0f80862 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1975612 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>