Create MAINTAINERS.md (#90)

Signed-off-by: Mathieu Benoit <mathieu-benoit@hotmail.fr>

MAINTAINERS.md

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+# Score maintainers
+
+The following is the list of maintainers for all Score repositories, in alphabetical order:
+
+- Ben Meier (Humanitec) [@astromechza](https://github.com/astromechza)
+- Chris Stephenson (Humanitec) [@chrishumanitec](https://github.com/chrishumanitec)
+- Mathieu Benoit (Humanitec) [@mathieu-benoit](https://github.com/mathieu-benoit)
+- Susa Tünker (Checkly) [@sujaya-sys](https://github.com/sujaya-sys)