Client API usage example

[cole-miller]

Don't merge this, pushing as a demonstration.

Compile and run the demo program like this:

make libdqlite.la
libtool --mode=compile gcc -c demo.c -o demo.lo
libtool --mode=link gcc libdqlite.la demo.lo -o demo
LIBDQLITE_TRACE=1 LIBRAFT_TRACE=1 libtool --mode=execute ./demo # or '... gdb ./demo'

[codecov[bot]]

Codecov Report

Merging #470 (1125065) into master (690818b) will increase coverage by 11.47%. The diff coverage is 15.11%.

:exclamation: Current head 1125065 differs from pull request most recent head 33afd19. Consider uploading reports for the commit 33afd19 to get more accurate results

@@             Coverage Diff             @@
##           master     #470       +/-   ##
===========================================
+ Coverage   58.86%   70.34%   +11.47%     
===========================================
  Files          33       34        +1     
  Lines        5915     6025      +110     
  Branches     1768     1940      +172     
===========================================
+ Hits         3482     4238      +756     
+ Misses       1366     1123      -243     
+ Partials     1067      664      -403     

Impacted Files	Coverage Δ
src/client/easy.c	9.21% <9.21%> (ø)
src/client/protocol.c	48.16% <60.00%> (+14.50%)	:arrow_up:
src/lib/fs.c	83.33% <0.00%> (ø)
src/lib/addr.c	71.42% <0.00%> (+2.07%)	:arrow_up:
src/dqlite.c	84.84% <0.00%> (+3.03%)	:arrow_up:
src/lib/serialize.h	85.48% <0.00%> (+3.22%)	:arrow_up:
src/logger.c	4.16% <0.00%> (+4.16%)	:arrow_up:
src/config.c	95.65% <0.00%> (+4.34%)	:arrow_up:
src/registry.c	95.65% <0.00%> (+4.34%)	:arrow_up:
src/lib/transport.c	91.42% <0.00%> (+5.71%)	:arrow_up:
... and 20 more

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