Add CodeQL badge.
diff --git a/README.md b/README.md
index 5238ce5..1fc541f 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@
[](https://coveralls.io/r/apache/commons-lang)
[](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-lang3/)
[](https://javadoc.io/doc/org.apache.commons/commons-lang3/3.12.0)
+[](https://github.com/apache/commons-lang/actions?query=workflow%3ACodeQL)
Apache Commons Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so