Added English window-manager

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

en/readme/window-manager.md

@@ -3,6 +3,7 @@
 ## Introduction
 
 The Window Manager subsystem provides basic capabilities of window and display management. It is the basis for UI display. The following figure shows the architecture of the Window Manager subsystem.
+
 **Figure 1** Architecture of the Window Manager subsystem
 
 ![WindowManager-subsystem-architecture](./figures/WindowManager.png)