Add Vijayan as Maintainer of OpenSearch Benchmark Workloads (#287)

Signed-off-by: Ian Hoang <hoangia@amazon.com>
Co-authored-by: Ian Hoang <hoangia@amazon.com>

.github/CODEOWNERS

@@ -1 +1 @@
-* @IanHoang @gkamat @beaioun @cgchinmay @rishabh6788
+* @IanHoang @gkamat @beaioun @cgchinmay @rishabh6788 @VijayanB

MAINTAINERS.md

@@ -4,10 +4,11 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 
 ## Current Maintainers
 
-| Maintainer       | GitHub ID                                             | Affiliation |
-| ---------------- | ----------------------------------------------------- | ----------- |
-| Ian Hoang        | [IanHoang](https://github.com/IanHoang)               | Amazon      |
-| Govind Kamat     | [gkamat](https://github.com/gkamat)                   | Amazon      |
-| Mingyang Shi     | [beaioun](https://github.com/beaioun)                 | OSCI        |
-| Chinmay Gadgil   | [cgchinmay](https://github.com/cgchinmay)             | Amazon      |
-| Rishabh Singh    | [rishabh6788](https://github.com/rishabh6788)         | Amazon      |
+| Maintainer              | GitHub ID                                             | Affiliation |
+| ----------------------- | ----------------------------------------------------- | ----------- |
+| Ian Hoang               | [IanHoang](https://github.com/IanHoang)               | Amazon      |
+| Govind Kamat            | [gkamat](https://github.com/gkamat)                   | Amazon      |
+| Mingyang Shi            | [beaioun](https://github.com/beaioun)                 | OSCI        |
+| Chinmay Gadgil          | [cgchinmay](https://github.com/cgchinmay)             | Amazon      |
+| Rishabh Singh           | [rishabh6788](https://github.com/rishabh6788)         | Amazon      |
+| Vijayan Balasubramanian | [VijayanB](https://github.com/VijayanB)               | Amazon      |