Add: contributors and maintainers lists

CONTRIBUTORS.md

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+# Contributors to AWS IoT Reference Architecture
+Special thanks for all the people who have contributed to this project so far.
+
+## Organizations
+* [56k.Cloud](https://www.56k.cloud/en)
+* [HES-SO](https://www.hes-so.ch/en/homepage)
+
+## Individuals
+* Xavier Clivaz ([@kevax24](https://github.com/kevax24))
+* Jean-Pierre Gehrig ([@jpgehrig](https://github.com/jpgehrig))
+* Firas Cheaib ([@firsou](https://github.com/firsou))
+* Fabien Vannel ([@fvannel](https://github.com/fvannel))

MAINTAINERS.toml

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+# AWS IoT Reference Architecture maintainers file
+#
+# This file lists the maintainers of the 56kcloud/aws-iot-reference-architecture project.
+#
+# Its structure is inspired from the maintainers files in the Docker Github
+# repositories. Please see the MAINTAINERS file in docker/opensource for more
+# information.
+
+[maintainers]
+
+# Core maintainers of the project.
+
+    [maintainers.core]
+    people = [
+      "kevax24",
+    ]
+
+[people]
+
+# A reference list of all people associated with the project.
+
+    [people.kevax24]
+    Name = "Xavier Clivaz"
+    Email = "[email protected]"
+    GitHub = "kevax24"