RELICENSE: Fabrice Fontaine

Create RELICENSE/FabriceFontaine.md
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

RELICENSE/FabriceFontaine.md

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Fabrice Fontaine
+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 "ffontaine", with
+commit author "Fabrice Fontaine <fontaine.fabrice@gmail.com>", are copyright of Fabrice Fontaine.
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+
+Fabrice Fontaine
+2018-09-13