Provide a way to skip files

Currently the tool will process all json files, in some instances it could be super handy to provide the ability to skip a named file or pattern of files. Often we will have scratch json files in folders and as they are not referenced in the schema itself they are by default not seen (ignored). The ability to provide a way to opt these files out of processing would be handy.

The issue names no files, tests, or entry points. First inspect how the tool discovers and selects JSON files and how options are exposed; clarify whether skipping accepts names, patterns, or both, then add coverage showing skipped files are not processed.

Written by the indexing model from the issue text.