Update 3 1 ui components

3-1-ui-components.md

 # UI components & terminologies
 ### UI components
 
+<p align="center">
 ![](img/3-1-ui-components.png)
 
 When you first start Mirae WAVE, this environment consists of the following elements (by default):
 
 ##### 1. The **Menu Bar** contains menus for controlling and rendering 3-D images.
 
+<p align="center">
 ![](img/3-1-1-ui-menu-bar.png)
 
 *  Commands can be represented as buttons on the *Quick Access Toolbar*. You can customize the toolbar to include any command that you use frequently by right-click on **Menu Bar** area.