Update readme about archivation and links to official sonar-kotlin

Author: arturbosch

README.md

@@ -1,5 +1,13 @@
 # sonar-detekt
 
+Now that Sonarqube officially supports Kotlin with detekt issue import, this plugin repository has been archived.
+
+Some links which may help you setup sonar-kotlin with detekt findings:
+- Sonar-Kotlin documentation: https://docs.sonarsource.com/sonarqube/latest/analyzing-source-code/languages/kotlin/
+- External analyzers: https://docs.sonarsource.com/sonarqube/latest/analyzing-source-code/importing-external-issues/external-analyzer-reports/
+
+---
+
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