Update ReadMe.md

添加简介以及用法
yhjiang · May 28, 2014 · 901f8a0 · 901f8a0
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-自定义的Tabbar
+
+##介绍
+
+CustomTabBar是一款自定义的Tabbar，继承UITabbarViewController，可自定义tab图片，背景，以及选中背景。
+
+
+##截图
+<img  width="320" height="480" src="https://raw.githubusercontent.com/yhjiang/CustomTabBar/master/ScreenShot1.png"/> 
+
+
+##用法
+```
+//初始化ViewController
+    FirstViewController *home = [[FirstViewController alloc] init];
+    home.title = @"首页";
+    
+    SecondViewController *list = [[SecondViewController alloc] init];
+    list.title = @"推荐";
+    
+    ThirdViewController *search = [[ThirdViewController alloc] init];
+    search.title = @"搜索";
+    
+    FourthViewController *more = [[FourthViewController alloc] init];
+    more.title = @"更多";
+    
+    //创建导航
+    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:home];
+    UINavigationController *nav2 = [[ UINavigationController alloc] initWithRootViewController:list];
+    UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:search];
+    UINavigationController *nav4 = [[UINavigationController alloc]initWithRootViewController:more];
+    
+    //把VC放到数组中
+    NSMutableArray *controllers = [NSMutableArray arrayWithArray:@[nav1,nav2,nav3,nav4]];
+    
+    //初始化Tabbarcontroller
+    _tabbarController = [[YHCustomTabbar alloc] init];
+    _tabbarController.viewControllers = controllers;
+    _tabbarController.selectedIndex = 0;
+    
+    [self.window setRootViewController:_tabbarController];
+    
+ ```