MAINTAINERS.md: New file

Let's match the CNCF standards here.

Signed-off-by: Colin Walters <walters@verbum.org>

MAINTAINERS.md

@@ -0,0 +1,13 @@
+# Maintainers
+
+The current Maintainers Group for the bootc Project consists of:
+
+| Name | GitHub ID | Employer | Responsibilities |
+| ---- | ---- | ---- | ---- |
+| Chris Kyrouac | [ckyrouac](https://github.com/orgs/containers/people/ckyrouac) | Red Hat | Approver |
+| Colin Walters | [cgwalters](https://github.com/orgs/containers/people/cgwalters) | Red Hat | Approver |
+| John Eckersberg | [jeckersb](https://github.com/orgs/containers/people/jeckersb) | Red Hat | Approver |
+
+This list must be kept in sync with the [CNCF Project Maintainers list](https://github.com/cncf/foundation/blob/master/project-maintainers.csv).
+
+See [the project Governance](GOVERNANCE.md) for how maintainers are selected and replaced.