Accepting request 793075 from home:weberho:tools

Coturn is a STUN/TURN server which works nicely e.g. nextcloud. I'd like to offer that project in factory and Leap.
Please review. If you like the package I'll request the coturn user/group for factory.

OBS-URL: https://build.opensuse.org/request/show/793075
OBS-URL: https://build.opensuse.org/package/show/network:telephony/coturn?expand=0&rev=1

README.SUSE

@@ -0,0 +1,8 @@
+Configuration files:
+  * /etc/coturn/turnserver.conf is the mail configuration file
+  * /etc/sysconfig/coturn can be used to set additional command line parameters
+
+To allow traffic going thru the firewall use
+```
+firewall-cmd --zone=public --add-service=coturn [--permanent]
+```