add MAINTAINERS.md

Author: lucix-aws

MAINTAINERS.md

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+# Maintainers
+
+This page lists all active maintainers of this repository.
+
+If attempting to tag a maintainer, please ensure that they are active (i.e. not on the Emeritus list).
+
+If you were a maintainer and would like to add your name to the Emeritus list, please send us a PR.
+
+See [CONTRIBUTING.md](https://github.com/aws/aws-sdk-go-v2/blob/main/CONTRIBUTING.md) for general contribution guidelines.
+
+## Maintainers (in alphabetical order)
+* [Madrigal](https://github.com/Madrigal)
+* [lucix-aws](https://github.com/lucix-aws)
+* [wty-Bryant](https://github.com/wty-Bryant)
+
+## Emeritus (in alphabetical order)
+* [JordonPhillips](https://github.com/JordonPhillips)
+* [RanVaknin](https://github.com/RanVaknin)
+* [aajtodd](https://github.com/aajtodd)
+* [isaiahvita](https://github.com/isaiahvita)
+* [jasdel](https://github.com/jasdel)
+* [skmcgrail](https://github.com/skmcgrail)
+* [skotambkar](https://github.com/skotambkar)
+* [xibz](https://github.com/xibz)