add preliminary ADMIN docs, with notes on testing STUN/TURN service

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+## TURN service validation
+
+Install package coturn (and stop and disable the service if unneeded).
+
+Simple test anonymous insecure STUN service:
+
+turnutils_stunclient -f turn1.debian.net
+
+(seems that if it hangs, it is the server offering a bogus secondary IP)
+
+Test anonymous insecure STUN service (udp and tcp:
+
+turnutils_uclient turn1.debian.net -y
+turnutils_uclient turn1.debian.net -t -y
+
+(check for packet loss)
+
+
+
+Alternatives STUN/TURN validation:
+<https://stackoverflow.com/questions/28772212/stun-turn-server-connectivity-test>
+
+STUN/TURN validation service:
+<https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/>
+
+<https://ip8.com/webrtc-test>
+<https://testrtc.com/>
+<https://networktest.twilio.com/>
+
+Public STUN/TURN services:
+https://github.com/DamonOehlman/freeice#current-list-of-servers
+
+Nice explanation of turnutils_stunclient:
+<https://gist.github.com/cameron-elliott/be1e581cb7b28f748e04bcabc249e6b6>
+
+## TURN service REST interface
+
+<https://stackoverflow.com/questions/35766382/coturn-how-to-use-turn-rest-api>