doc: add a badge into README.md

[LinuxSuRen]

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
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[codacy-production]

Coverage summary from Codacy

Merging #65 (3718e61) into master (bb74504) - See PR on Codacy

Coverage variation	Diff coverage
-0.08%	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bb74504)	1184	1100	92.91%
Head commit (3718e61)	1184 (+0)	1099 (-1)	92.82% (-0.08%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#65)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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