fix: add badges

README.md

@@ -1,14 +1,8 @@
+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=triplem_khol&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=triplem_khol)
+[![Workflow Status](https://github.com/triplem/khol/actions/workflows/continuous-integration.yml/badge.svg)](https://github.com/triplem/khol/actions/workflows/continuous-integration.yml)
+
 # khol
 
 A pure kotlin implementation for the Holiday Calculation.
 
 https://central.sonatype.org/publish/requirements/gpg/#signing-a-file
-
-
-The following variable need to be set in github to be able to allow releasing to maven central (basically it should be
-the gpg key used for signing):
-
-*  export ORG_GRADLE_PROJECT_signingInMemoryKey
-
-see https://vanniktech.github.io/gradle-maven-publish-plugin/central/#secrets and 
-https://vanniktech.github.io/gradle-maven-publish-plugin/central/#in-memory-gpg-key for details.