Add Mac OS 6 to 9 specific files

Metas databases (https://web.archive.org/web/20230328234043/https://support.apple.com/kb/TA46427?locale=en_US), Sherlock settings, Find By Content indexer folders (https://netatalk.io/docs/Special-Files-and-Folders, https://www.kb.cert.org/vuls/id/177243/)

Author: mems

Global/macOS.gitignore

@@ -22,3 +22,12 @@ Icon[]
 Network Trash Folder
 Temporary Items
 .apdisk
+
+# Mac OS 6 to 9
+Desktop DB
+Desktop DF
+TheFindByContentFolder
+TheVolumeSettingsFolder
+.FBCIndex
+.FBCSemaphoreFile
+.FBCLockFolder