Update codeowners

Signed-off-by: Sergen Yalçın <yalcinsergen97@gmail.com>

Author: sergenyalcin

CODEOWNERS

@@ -14,4 +14,4 @@
 # See also OWNERS.md for governance details
 
 # Fallback owners
-*			@sergenyalcin @turkenf @jeanduplessis
+*			@sergenyalcin @turkenf @jeanduplessis @ulucinar @erhancagirici

OWNERS.md

@@ -0,0 +1,16 @@
+# OWNERS
+
+This page lists all maintainers for **this** repository. Each repository in the [Upbound
+organization](https://github.com/upbound/) will list their repository maintainers in their own
+`OWNERS.md` file.
+
+
+## Maintainers
+
+* Alper Ulucinar <alper@upbound.com> ([ulucinar](https://github.com/ulucinar))
+* Sergen Yalcin <sergen@upbound.com> ([sergenyalcin](https://github.com/sergenyalcin))
+* Fatih Turken <fatih@upbound.io> ([turkenf](https://github.com/turkenf))
+* Erhan Cagirici <erhan@upbound.io> ([erhancagirici](https://github.com/erhancagirici))
+* Jean du Plessis <jean@upbound.io> ([jeanduplessis](https://github.com/jeanduplessis))
+
+See [CODEOWNERS](./CODEOWNERS) for automatic PR assignment.