Add relicense

RELICENSE/mjvk.md

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Simon Giesecke that grants permission to
+relicense its copyrights in the libzmq C++ library (ZeroMQ) under the
+Mozilla Public License v2 (MPLv2) or any other Open Source Initiative
+approved license chosen by the current ZeroMQ BDFL (Benevolent
+Dictator for Life).
+
+A portion of the commits made by the Github handle "mjvk", with
+commit author "Mark Jan van Kampen <markjanvankampen@gmail.com>", are
+copyright of Mark Jan van Kampen.  This document hereby grants the libzmq
+project team to relicense libzmq, including all past, present and
+future contributions of the author listed above.
+
+Mark Jan van Kampen
+2020/02/24
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