How can I add Images.xcassets my project? about xcodeeditor HOT 1 OPEN

static NSDictionary* NSDictionaryWithXCFileReferenceTypes()
{
    static NSDictionary* dictionary;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^
    {
        dictionary = @{
            @"sourcecode.c.h"        : @(SourceCodeHeader),
            @"sourcecode.c.objc"     : @(SourceCodeObjC),
            @"wrapper.framework"     : @(Framework),
            @"text.plist.strings"    : @(PropertyList),
            @"sourcecode.cpp.objcpp" : @(SourceCodeObjCPlusPlus),
            @"sourcecode.cpp.cpp"    : @(SourceCodeCPlusPlus),
            @"file.xib"              : @(XibFile),
            @"image.png"             : @(ImageResourcePNG),
            @"wrapper.cfbundle"      : @(Bundle),
            @"archive.ar"            : @(Archive),
            @"text.html"             : @(HTML),
            @"text"                  : @(TEXT),
            @"wrapper.pb-project"    : @(XcodeProject),
            @"folder"                : @(Folder)
        };
    });

    return dictionary;
}