examples/README.md

[fangyincheng]

What this PR does:

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #196 into master will increase coverage by 0.95%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
+ Coverage   66.51%   67.47%   +0.95%     
==========================================
  Files          90       90              
  Lines        5540     5540              
==========================================
+ Hits         3685     3738      +53     
+ Misses       1464     1408      -56     
- Partials      391      394       +3

Impacted Files	Coverage Δ
cluster/cluster_impl/failback_cluster_invoker.go	79.12% <0%> (-2.2%)	⬇️
registry/etcdv3/registry.go	55.74% <0%> (-1.15%)	⬇️
protocol/dubbo/readwriter.go	74.35% <0%> (+2.56%)	⬆️
protocol/dubbo/codec.go	82.35% <0%> (+8.82%)	⬆️
protocol/dubbo/listener.go	64.81% <0%> (+10.64%)	⬆️
protocol/dubbo/pool.go	74.86% <0%> (+15.84%)	⬆️

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