更新sdkdemo引导文档

Change-Id: Ief1ea06ee420047a0d86a2bd223b61c358a6e68b

Author: tonychanchen

doc/SDK开发/APP SDK创建引导.md

@@ -5,16 +5,23 @@
 打开 Appdelegate.m 文件，引入SDK 头文件 ,并添加 SDK 配置。   
 
 ```
-    #import <QCFoundation/TIoTCoreFoundation.h>
-    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-         // Override point for customization after application launch.
+#import <QCFoundation/TIoTCoreFoundation.h>
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+    // Override point for customization after application launch.
 
-         [[TIoTCoreServices shared] setAppKey:@"物联网开发平台申请的 App Key"];
-         [TIoTCoreServices shared].logEnable = YES;
-
-         self.window.rootViewController = [[UINavigationController alloc]initWithRootViewController:[UIViewController new]];
-         }
-
-         return YES;
-    }    
+	/*
+     * 此处仅供参考, 需自建服务接入物联网平台服务，以免 App Secret 泄露
+     * 自建服务可参考此处 https://cloud.tencent.com/document/product/1081/45901#.E6.90.AD.E5.BB.BA.E5.90.8E.E5.8F.B0.E6.9C.8D.E5.8A.A1.2C-.E5.B0.86-app-api-.E8.B0.83.E7.94.A8.E7.94.B1.E8.AE.BE.E5.A4.87.E7.AB.AF.E5.8F.91.E8.B5.B7.E5.88.87.E6.8D.A2.E4.B8.BA.E7.94.B1.E8.87.AA.E5.BB.BA.E5.90.8E.E5.8F.B0.E6.9C.8D.E5.8A.A1.E5.8F.91.E8.B5.B7
+     */
+    
+	TIoTCoreAppEnvironment *environment = [TIoTCoreAppEnvironment shareEnvironment];
+	[environment setEnvironment];
+    
+	environment.appKey = @"物联网开发平台申请的 App Key";
+	environment.appSecret = @"物联网开发平台申请的 App Secret";
+	self.window.rootViewController = [[UINavigationController alloc]initWithRootViewController:[UIViewController new]];
+		
+	}
+	return YES;
+}    
 ```