chore: update Code of Conduct to Contributor Covenant v3.0 and README… #328

Job	Run time
Build + unit tests / gradle build test	1m 1s
Integration tests / gradle intTest	30s
Code Analysis (multi) / GitHub CodeQL Analysis / CodeQL Analysis	1m 34s
Code Analysis (multi) / Trivy Security Scan / Trivy scan (JVM)	1m 22s
Publish artifact (Maven Central) / gradle publish (Maven Central)	46s
Publish javadoc (GitHub Pages) / Generate Javadoc	27s
Create release	0s
Publish javadoc (GitHub Pages) / Deploy (GH Pages)	5s
	5m 45s

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