Add AUTHORS and .mailmap

Author: nilmerg

.mailmap

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+Alexander A. Klimov <alexander.klimov@icinga.com> <al2klimov@gmail.com>
+Alexander A. Klimov <alexander.klimov@icinga.com> <alexander.klimov@icinga.com>
+Noé Costa <noe.costa@icinga.com> <146938323+ncosta-ic@users.noreply.github.com>
+Ravi Kumar Kempapura Srinivasa <ravi.srinivasa@icinga.com> <33730024+raviks789@users.noreply.github.com>
+Ravi Kumar Kempapura Srinivasa <ravi.srinivasa@icinga.com> <raviks789@gmail.com>
+Sukhwinder Dhillon <sukhwinder.dhillon@icinga.com> <54990055+sukhwinder33445@users.noreply.github.com>
+Sukhwinder Dhillon <sukhwinder.dhillon@icinga.com> <sukhwinder33445@gmail.com>
+Yonas Habteab <yonas.habteab@icinga.com> <yonas.habteab@netways.de>

AUTHORS

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+Alexander A. Klimov <alexander.klimov@icinga.com>
+Alvar Penning <alvar.penning@icinga.com>
+Florian Strohmaier <florian.strohmaier@icinga.com>
+Johannes Meyer <johannes.meyer@icinga.com>
+Noé Costa <noe.costa@icinga.com>
+Ravi Kumar Kempapura Srinivasa <ravi.srinivasa@icinga.com>
+Sukhwinder Dhillon <sukhwinder.dhillon@icinga.com>
+Yonas Habteab <yonas.habteab@icinga.com>