Add example folder

[codecov[bot]]

Codecov Report

Merging #81 (d83352f) into JOSS (643514a) will increase coverage by 2.75%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             JOSS      #81      +/-   ##
==========================================
+ Coverage   80.57%   83.32%   +2.75%     
==========================================
  Files          34       30       -4     
  Lines        2728     2015     -713     
==========================================
- Hits         2198     1679     -519     
+ Misses        530      336     -194     

Impacted Files	Coverage Δ
src/multilayergraph.jl	89.01% <0.00%> (-3.95%)	:arrow_down:
src/multilayerdigraph.jl	90.69% <0.00%> (-2.01%)	:arrow_down:
src/abstractmultilayergraph.jl	87.65% <0.00%> (-0.56%)	:arrow_down:
src/multiplexgraph.jl
src/abstractmultiplexdigraph.jl
src/synchronizedmultiplexgraph.jl
src/abstractmultiplexugraph.jl
src/abstractmultilayerdigraph.jl	98.79% <0.00%> (+0.77%)	:arrow_up:
src/abstractmultilayerugraph.jl	99.37% <0.00%> (+0.94%)	:arrow_up:

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