add hello example

[ijt]

This is derived from https://zguide.zeromq.org/docs/chapter1/.

[codecov[bot]]

Codecov Report

Merging #121 (a37190e) into master (b7c2c56) will decrease coverage by 0.20%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   67.40%   67.19%   -0.21%     
==========================================
  Files          29       29              
  Lines        1813     1814       +1     
==========================================
- Hits         1222     1219       -3     
- Misses        490      493       +3     
- Partials      101      102       +1     

Impacted Files	Coverage Δ
internal/inproc/inproc.go	70.88% <0.00%> (-1.27%)	:arrow_down:
conn.go	54.02% <0.00%> (-1.15%)	:arrow_down:
msg.go	68.29% <0.00%> (ø)
security.go	44.44% <0.00%> (ø)
socket_types.go	92.15% <0.00%> (ø)
cxx_zmq4_compat.go	47.05% <0.00%> (ø)
security/null/null.go	47.36% <0.00%> (ø)
security/plain/plain.go	43.93% <0.00%> (ø)
protocol.go	77.57% <0.00%> (+0.21%)	:arrow_up:

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[ijt]

Got it. I don't see an AUTHORS file or a CONTRIBUTORS file. Did you want me to add one?

[sbinet]

these files are in the license repo:

https://github.com/go-zeromq/license

[ijt]

these files are in the license repo:

https://github.com/go-zeromq/license

Got that. Pull requests created.

[sbinet]

needs https://github.com/go-zeromq/license/pull/10 and https://github.com/go-zeromq/license/pull/11

[sbinet]

thanks a lot and welcome to go-zeromq :)