Add Atri Sharma as a maintainer (#19221)

Author: andrross

MAINTAINERS.md

@@ -11,6 +11,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Andriy Redko      | [reta](https://github.com/reta)                         | Independent |
 | Ankit Jain        | [jainankitk](https://github.com/jainankitk)             | Amazon      |
 | Ashish Singh      | [ashking94](https://github.com/ashking94)               | Amazon      |
+| Atri Sharma       | [atris](https://github.com/atris)                       | Apple       |
 | Bharathwaj G      | [bharath-techie](https://github.com/bharath-techie)     | Amazon      |
 | Bukhtawar Khan    | [Bukhtawar](https://github.com/Bukhtawar)               | Amazon      |
 | Charlotte Henkle  | [CEHENKLE](https://github.com/CEHENKLE)                 | Amazon      |