Make ServerConfiguration.addAuthenticationSchema fluent
diff --git a/scim-server/src/main/java/org/apache/directory/scim/server/configuration/ServerConfiguration.java b/scim-server/src/main/java/org/apache/directory/scim/server/configuration/ServerConfiguration.java
index 41445f1..6ed666d 100644
--- a/scim-server/src/main/java/org/apache/directory/scim/server/configuration/ServerConfiguration.java
+++ b/scim-server/src/main/java/org/apache/directory/scim/server/configuration/ServerConfiguration.java
@@ -78,9 +78,10 @@
   public List<AuthenticationSchema> getAuthenticationSchemas() {
     return Collections.unmodifiableList(authenticationSchemas);
   }
-  
-  public void addAuthenticationSchema(AuthenticationSchema authenticationSchema) {
+
+  public ServerConfiguration addAuthenticationSchema(AuthenticationSchema authenticationSchema) {
     authenticationSchemas.add(authenticationSchema);
+    return this;
   }
 
   public SupportedConfiguration getChangePasswordConfiguration() {