start doc on modifying user manager tru ui

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1413145 13f79535-47bb-0310-9956-ffa450edef68

archiva-docs/src/site/apt/adminguide/users-manager-implementation.apt

@@ -0,0 +1,30 @@
+ ------
+ Apache Archiva User Manager Implementation
+ ------
+ Olivier Lamy
+ ------
+ 2012-11-24
+ ------
+
+~~ Licensed to the Apache Software Foundation (ASF) under one                      
+~~ or more contributor license agreements.  See the NOTICE file                    
+~~ distributed with this work for additional information                           
+~~ regarding copyright ownership.  The ASF licenses this file                      
+~~ to you under the Apache License, Version 2.0 (the                               
+~~ "License"); you may not use this file except in compliance                      
+~~ with the License.  You may obtain a copy of the License at                      
+~~                                                                                 
+~~   http://www.apache.org/licenses/LICENSE-2.0                                    
+~~                                                                                 
+~~ Unless required by applicable law or agreed to in writing,                      
+~~ software distributed under the License is distributed on an                     
+~~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY                          
+~~ KIND, either express or implied.  See the License for the                       
+~~ specific language governing permissions and limitations                         
+~~ under the License.                                                              
+
+Apache Archiva User Manager Implementation
+
+  Since 1.4-M4, you can choose to switch User Manager Implementation you are using dynamically.
+
+[../images/user-manager-impl.png]