Add maintainer

Signed-off-by: Alexandros Filios <alexandros.filios@ibm.com>

Author: alexandrosfilios

MAINTAINERS.md

@@ -3,11 +3,12 @@ Maintainers
 
 **Active Maintainers**
 
-| Name | GitHub | Chat | email
-|------|--------|------|----------------------
-| Angelo De Caro | [adecaro][adecaro] | adecaro | <adc@zurich.ibm.com>
-| Kaoutar Elkhiyaoui | [KElkhiyaoui][KElkhiyaoui] | KElkhiyaoui | <kao@zurich.ibm.com>
-| Arne Rutjes | [arner][arner] | arner | <arne.rutjesISC@nl.ibm.com>
+| Name               | GitHub                               | Chat        | email                       |
+|--------------------|--------------------------------------|-------------|-----------------------------|
+| Angelo De Caro     | [adecaro][adecaro]                   | adecaro     | <adc@zurich.ibm.com>        |
+| Kaoutar Elkhiyaoui | [KElkhiyaoui][KElkhiyaoui]           | KElkhiyaoui | <kao@zurich.ibm.com>        |
+| Arne Rutjes        | [arner][arner]                       | arner       | <arne.rutjesISC@nl.ibm.com> |
+| Alexandros Filios  | [alexandrosfilios][alexandrosfilios] | lio         | <alexandros.filios@ibm.com> |
 
 **Emeritus Maintainers**
 
@@ -23,3 +24,4 @@ Maintainers
 [mffrench]: https://github.com/mffrench
 [ale-linux]: https://github.com/ale-linux
 [arner]: https://github.com/arner
+[alexandrosfilios]: https://github.com/alexandrosfilios