Add a new server instance in the server registry.
Parameters: url - URL to access deployment manager. Parameters: username - username used by the deployment manager. Parameters: password - password used by the deployment manager. Parameters: displayName - display name wich represents server instance in IDE. Parameters: initialProperties - any other properties to set during the instance creation.If the map contains any of InstanceProperties.URL_ATTR,InstanceProperties.USERNAME_ATTR, InstanceProperties.PASSWORD_ATTRor InstanceProperties.DISPLAY_NAME_ATTR they will be ignored- the explicit parameter values are always used.null is accepted. throws: InstanceCreationException - when instance with same url is alreadyregistered.