Baselines the MAINTAINERS.md and CODEOWNERS files. Resolves opensearch-project#196. (opensearch-project#203)

Signed-off-by: David Venable <dlv@amazon.com>

Author: dlvenable

.github/CODEOWNERS

@@ -1,2 +1,4 @@
-# This should match the owning team set up in https://github.com/orgs/opensearch-project/teams
-*   @opensearch-project/logstash-output-opensearch
+# This should match the list of maintainers in MAINTAINERS.md
+* @asifsmohammed
+* @dlvenable
+* @oeyh

MAINTAINERS.md

@@ -4,11 +4,21 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 
 ## Current Maintainers
 
+
+| Maintainer              | GitHub ID                                   | Affiliation |
+| ----------------------- | ------------------------------------------- | ----------- |
+| Asif Sohail Mohammed | [asifsmohammed](https://github.com/asifsmohammed)     | Amazon      |
+| David Venable        | [dlvenable](https://github.com/dlvenable)             | Amazon      |
+| Hai Yan              | [oeyh](https://github.com/oeyh)                       | Amazon      |
+
+
+
+## Emeritus
+
 | Maintainer              | GitHub ID                                   | Affiliation |
 | ----------------------- | ------------------------------------------- | ----------- |
 | Jack Mazanec            | [jmazanec15](https://github.com/jmazanec15) | Amazon      |
 | Vamshi Vijay Nakkirtha  | [vamshin](https://github.com/vamshin)       | Amazon      |
 | Vijayan Balasubramanian | [VijayanB](https://github.com/VijayanB)     | Amazon      |
 | Deep Datta              | [deepdatta](https://github.com/deepdatta)   | Amazon      |
-| David Venable           | [dlvenable](https://github.com/dlvenable)   | Amazon      |
 | Shivani Shukla          | [sshivanii](https://github.com/sshivanii)   | Amazon      |