chore: Add OWNERS.md (#225)

Signed-off-by: Maximilian Blatt <maximilian.blatt-extern@deutschebahn.com>

OWNERS.md

@@ -0,0 +1,16 @@
+# OWNERS
+
+This page lists all maintainers for **this** repository. Each repository in the [Crossplane
+organization](https://github.com/crossplane/) will list their repository maintainers in their own
+`OWNERS.md` file.
+
+Please see the Crossplane
+[GOVERNANCE.md](https://github.com/crossplane/crossplane/blob/master/GOVERNANCE.md) for governance
+guidelines and responsibilities for the steering committee and maintainers.
+
+## Maintainers
+
+* Jan Willies ([janwillies](https://github.com/janwillies))
+* Maximilian Blatt ([MisterMX](https://github.com/MisterMX))
+* Ana Garlau ([anagarlau](https://github.com/anagarlau))
+* Christopher Junk ([christopherj](https://github.com/christopherj))