Add MAINTAINERS.md file (#1277)

Signed-off-by: Juan Estrella <juan.estrella@finos.org>
Co-authored-by: Damian Reeves <957246+DamianReeves@users.noreply.github.com>

Author: TheJuanAndOnly99

MAINTAINERS.md

@@ -0,0 +1,25 @@
+# Maintainers
+
+This file lists the maintainers of this repository.
+
+## Current maintainers
+
+| GitHub Username | Name | Organization | Email |
+|----------------|------|--------------|-------|
+| @AttilaMihaly | Attila Mihaly | Morgan Stanley | *please add email* |
+| @DamianReeves | Damian Reeves | @CapitalOne | *please add email* |
+| @nwokafor-choongsaeng | Nwokafor Choongsaeng | *please add organization* | *please add email* |
+| @psmulovics | Peter Smulovics | Morgan Stanley | *please add email* |
+| @stephengoldbaum | Stephen Goldbaum | *please add organization* | *please add email* |
+
+For information about maintainer responsibilities and resources, see the [FINOS Maintainers Cheatsheet](https://community.finos.org/docs/finos-maintainers-cheatsheet).
+
+## Updating this file
+
+All changes to the maintainer list are managed openly:
+
+- **Submit a Pull Request** to this file for any addition, removal, or update.
+- **If your project's governance requires a vote**, document or link to the vote outcome in the PR description or comments.
+- This process creates a public audit trail of project leadership over time.
+
+Please email **help@finos.org** whenever this file is updated with a change to maintainership.