Add maintenance terms.

Author: Crell

MAINTENANCE-TERMS.md

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+# Maintenance Terms
+
+Current as of 2025
+
+The code, text and data in this repository are provided as-is under
+the terms of the repository's LICENSE.md file, as a gift to the commons
+and the common good. In providing this software as-is, its author(s)
+admit no further obligations from anyone using the software for any reason,
+particularly with respect to:
+
+- Response time,
+- Change review and integration,
+- Disclosure schedules,
+- Discretionary, proprietary or otherwise secretive communications, and
+- Any other non-contractual obligations or conventions, regardless of
+  their presumed urgency or severity.
+
+The author(s) hope you find it valuable on those terms.
+
+Terms created by Mike Hoye - mhoye, 2025
+
+Original: https://github.com/mhoye/maintenance-terms