baseline repo permissions and groups (#314)

* baseline repo permissions and groups

Signed-off-by: Derek Ho <dxho@amazon.com>

* update baseline

Signed-off-by: Derek Ho <dxho@amazon.com>

* fix up codeowners

Signed-off-by: Derek Ho <dxho@amazon.com>

---------

Signed-off-by: Derek Ho <dxho@amazon.com>

CODEOWNERS

@@ -0,0 +1,2 @@
+# This should match the owning team set up in https://github.com/orgs/opensearch-project/teams
+*   @pjfitzgibbons @anirudha @ps48 @kavithacm @derek-ho @joshuali925 @dai-chen @YANG-DB @rupal-bq @mengweieric @vamsi-amazon @swiddis

MAINTAINERS.md

@@ -15,4 +15,13 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Rupal Mahajan     | [rupal-bq](https://github.com/rupal-bq)           | Amazon      |
 | Derek Ho          | [derek-ho](https://github.com/derek-ho)           | Amazon      |
 | Lior Perry        | [YANG-DB](https://github.com/YANG-DB)             | Amazon      |
-| Peter Fitzgibbons | [pjfitzgibbons](https://github.com/pjfitzgibbons) | Amazon      |
+| Peter Fitzgibbons | [pjfitzgibbons](https://github.com/pjfitzgibbons) | Amazon      |
+| Simeon Widdis     | [swiddis] (https://github.com/swiddis)            | Amazon      |
+
+## Emeritus Maintainers
+
+| Maintainer        | GitHub ID                                               | Affiliation |
+| ----------------- | ------------------------------------------------------- | ----------- |
+| Charlotte Henkle  | [CEHENKLE](https://github.com/CEHENKLE)                 | Amazon      |
+| Anirudha Jadhav   | [anirudha](https://github.com/anirudha)                 | Amazon      |
+| Nick Knize        | [nknize](https://github.com/nknize)                     | Amazon      |