[Feature Request]: add .rsyncingore file support.

[evan0greenup]

When backup a directory, not all files is essential, some files is generated from the other file like cache and intermediate file. It would be good to add support for .rsyncignore capability like how .gitignore does with exact the same rule syntax.

[WayneD]

See: https://download.samba.org/pub/rsync/rsync.1#opt-F