Add picture for sharding-scaling document

[KomachiSion]

No description provided.

[codecov-io]

Codecov Report

Merging #4912 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4912   +/-   ##
=========================================
  Coverage     54.53%   54.53%           
  Complexity      441      441           
=========================================
  Files          1137     1137           
  Lines         20455    20455           
  Branches       3759     3759           
=========================================
  Hits          11155    11155           
  Misses         8593     8593           
  Partials        707      707           

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[coveralls]

Pull Request Test Coverage Report for Build 2220

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.08%) to 58.128%

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Files with Coverage Reduction	New Missed Lines	%
sharding-orchestration/sharding-orchestration-core/sharding-orchestration-core-registrycenter/src/main/java/org/apache/shardingsphere/orchestration/core/registrycenter/util/IpUtils.java	2	80.0%

Totals
Change from base Build 10515:	0.08%
Covered Lines:	11890
Relevant Lines:	20455

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💛 - Coveralls