enable Sonarcloud checks

Author: rvema

.sonarcloud.properties

@@ -0,0 +1,15 @@
+# Path to sources
+#sonar.sources=.
+#sonar.exclusions=
+#sonar.inclusions=
+
+# Path to tests
+#sonar.tests=
+#sonar.test.exclusions=
+#sonar.test.inclusions=
+
+# Source encoding
+#sonar.sourceEncoding=UTF-8
+
+# Exclusions for copy-paste detection
+#sonar.cpd.exclusions=