Revert "remove CODE_SIGN_IDENTITY"

This reverts commit e7efa6c.

Author: kudoleh

ExampleMVVM.xcodeproj/project.pbxproj

@@ -1195,7 +1195,7 @@
 				API_BASE_URL = "http://api.themoviedb.org";
 				API_KEY = 2696829a81b1b5827d515ff121700838;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				CODE_SIGN_IDENTITY = "";
+				CODE_SIGN_IDENTITY = "iPhone Distribution";
 				CODE_SIGN_STYLE = Manual;
 				DEVELOPMENT_TEAM = "";
 				IMAGE_BASE_URL = "http://image.tmdb.org";