Add another real world example for Builder

iluwatar · iluwatar · commit 160b737dcc48 · 2019-11-13T18:16:50.000+02:00
diff --git a/builder/README.md b/builder/README.md
@@ -126,6 +126,7 @@ Use the Builder pattern when
 * [java.lang.StringBuffer](http://docs.oracle.com/javase/8/docs/api/java/lang/StringBuffer.html#append-boolean-)
 * All implementations of [java.lang.Appendable](http://docs.oracle.com/javase/8/docs/api/java/lang/Appendable.html)
 * [Apache Camel builders](https://github.com/apache/camel/tree/0e195428ee04531be27a0b659005e3aa8d159d23/camel-core/src/main/java/org/apache/camel/builder)
+* [Apache Commons Option.Builder](https://commons.apache.org/proper/commons-cli/apidocs/org/apache/commons/cli/Option.Builder.html)
 
 ## Credits
 
