add dummy server

[willstudy]

issue-138: #138

[codecov-io]

Codecov Report

Merging #139 into master will increase coverage by 0.27%.
The diff coverage is 20.38%.

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
+ Coverage   25.31%   25.59%   +0.27%     
==========================================
  Files          16       17       +1     
  Lines        2678     2731      +53     
==========================================
+ Hits          678      699      +21     
- Misses       1904     1933      +29     
- Partials       96       99       +3

Impacted Files	Coverage Δ
server/server.go	0% <ø> (ø)	⬆️
committee/recordtableoperator.go	0% <ø> (ø)	⬆️
committee/committee.go	3.39% <0%> (ø)	⬆️
server/dummy_server.go	39.62% <39.62%> (ø)

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