Add simple dangerfile

Author: OptimumCode

Dangerfile.df.kts

@@ -0,0 +1,11 @@
+@file:Suppress("ktlint:standard:no-wildcard-imports")
+
+import systems.danger.kotlin.*
+
+danger(args) {
+  onGitHub {
+    if (issue.labels.isEmpty()) {
+      fail("PR must have labels")
+    }
+  }
+}