[Assist] Put openrc service in dnscrypt-proxy package

[bill-auger]

what Xavier is asking for is surely not as complicated as this
discussion would make it appear to be - an init script is a very
tiny simple thing to add to the system

when some init script is missing for openrc, it is not a case of
priority or favoritism - parabola was built upon arch, and arch
uses systemd - openrc support was added much more recently; but
not every program works with openrc without some special
attention - if no one has asked for openrc support for some
program before; then it has probably not been added yet - almost
every openrc init script in parabola, got there because someone
asked for it specifically - requests just like this one have
been the normal procedure

so what needs to happen exactly, does an init script for this
service exists anywhere, or maybe someone needs to write one?