update README.md

Author: tkhill-AWS

javav2/example_code/s3/README.md

@@ -79,6 +79,7 @@ Code excerpts that show you how to call individual service functions.
 Code examples that show you how to accomplish a specific task by calling multiple
 functions within the same service.
 
+- [Check if a bucket exists](src/main/java/com/example/s3/DoesBucketExist.java)
 - [Delete incomplete multipart uploads](src/main/java/com/example/s3/AbortMultipartUploadExamples.java)
 - [Download S3 'directories'](src/main/java/com/example/s3/transfermanager/S3DirectoriesDownloader.java)
 - [Download objects to a local directory](src/main/java/com/example/s3/transfermanager/DownloadToDirectory.java)
@@ -129,6 +130,18 @@ This example shows you how to do the following:
 <!--custom.basics.s3_Scenario_GettingStarted.end-->
 
 
+#### Check if a bucket exists
+
+This example shows you how to check if a bucket exists.
+
+
+<!--custom.scenario_prereqs.s3_Scenario_DoesBucketExist.start-->
+<!--custom.scenario_prereqs.s3_Scenario_DoesBucketExist.end-->
+
+
+<!--custom.scenarios.s3_Scenario_DoesBucketExist.start-->
+<!--custom.scenarios.s3_Scenario_DoesBucketExist.end-->
+
 #### Delete incomplete multipart uploads
 
 This example shows you how to how to delete or stop incomplete Amazon S3 multipart uploads.