Add relicensing statement for ferdnyc

Signed-off-by: FeRD (Frank Dana) <ferdnyc@gmail.com>

RELICENSE/ferdnyc.md

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Frank R. Dana Jr.
+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 "ferdnyc", with
+commit author "FeRD (Frank Dana)", are copyright of Frank R. Dana, Jr.
+This document hereby grants the libzmq project team to relicense libzmq, 
+including all past, present and future contributions of the author listed above.
+
+Frank Richard Dana, Jr.
+2020-03-16