add a image for alpha.en.md

[yang-7777]

add a image for alpha.en.md

[coveralls]

Pull Request Test Coverage Report for Build 14889

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 23 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.008%) to 35.04%

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Files with Coverage Reduction	New Missed Lines	%
shardingsphere-scaling/shardingsphere-scaling-core/src/main/java/org/apache/shardingsphere/scaling/core/job/preparer/ShardingScalingJobPreparer.java	2	95.45%
shardingsphere-scaling/shardingsphere-scaling-core/src/main/java/org/apache/shardingsphere/scaling/core/ScalingJobController.java	4	86.67%
shardingsphere-scaling/shardingsphere-scaling-core/src/main/java/org/apache/shardingsphere/scaling/core/schedule/ScalingTaskScheduler.java	8	83.33%
shardingsphere-scaling/shardingsphere-scaling-bootstrap/src/main/java/org/apache/shardingsphere/scaling/web/HttpServerHandler.java	9	86.36%

Totals
Change from base Build 14887:	0.008%
Covered Lines:	36518
Relevant Lines:	104217

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💛 - Coveralls