add archival notice to README

This repository is being archived. Point readers at the standard-library or community package that replaces it. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-09-07 13:08:44 +01:00
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 > [!IMPORTANT]
 > **This repository is archived and no longer maintained.**
 >
 > It re-implements directory walking that the standard library now provides,
 > and handles fewer edge cases.
 >
 > **Use instead:**
 > - Standard library [`io/fs.WalkDir`](https://pkg.go.dev/io/fs#WalkDir).
 > - [`github.com/bmatcuk/doublestar/v4`](https://github.com/bmatcuk/doublestar) for `**` glob and ignore-pattern matching.
 ---
 # Sqan
 A simple package to help scan files in a directory.