Update README.md with RepairKit summary

README.md

@@ -4,6 +4,9 @@ This package provides supplementary metadata generation for registry documents,
 
 ### Components
 
+#### [RepairKit](https://github.com/NASA-PDS/registry-sweepers/blob/main/src/pds/registrysweepers/repairkit/__init__.py)
+The repairkit sweeper applies idempotent transformations to targeted subsets of properties, for example ensuring that all properties expected to have array-like values are in fact arrays (as opposed to single-element arrays being flattened to strings during harvest).  Documents are processed based on whether their `ops:Provenance/ops:registry_sweepers_repairkit_version` is up-to-date relative to the sweeper codebase.
+
 #### [Provenance](https://github.com/NASA-PDS/registry-sweepers/blob/main/src/pds/registrysweepers/provenance.py)
 The provenance sweeper generates metadata for linking each version-superseded product with the versioned product which supersedes it.  The value of the successor is stored in the `ops:Provenance/ops:superseded_by` property.  This property will not be set for the latest version of any product.