range: added metadata to README.md
- infos/recommends =
- infos/placements = presetstorage postgetstorage
- infos/status = maintained conformant compatible coverage specific unittest tested libc preview experimental unfinished nodoc
-- infos/metadata =
+- infos/metadata = check/range check/range/type
- infos/description = tests if a value is within a given range
## Introduction ##
