Provides a Demo Extension

[juanpedromoreno]

... to combine different services in both server and client sides.

[fedefernandez]

👍 nice job!

[codecov-io]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is 0%.

@@         Coverage Diff          @@
##           master   #14   +/-   ##
====================================
  Coverage       0%    0%           
====================================
  Files           9    10    +1     
  Lines         122   130    +8     
  Branches        2     3    +1     
====================================
- Misses        122   130    +8

Impacted Files	Coverage Δ
.../main/scala/greeting/service/GreetingService.scala	0% <ø> (ø)
rpc/src/main/scala/server/package.scala	0% <ø> (ø)	⬆️
...ng/src/main/scala/greeting/runtime/implicits.scala	0% <0%> (ø)	⬆️
...ng/src/main/scala/greeting/GreetingClientApp.scala	0% <0%> (ø)	⬆️
.../src/main/scala/greeting/service/EchoService.scala	0% <0%> (ø)

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