🏷️ Introducing struct AppImages and Assets Dictionary for Images in the app

DouShouQi_App/DouShouQi_App/Assets/Images/Images.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

DouShouQi_App/DouShouQi_App/Assets/Images/Images.xcassets/TitlePageImage.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "title-background.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "preserves-vector-representation" : true
+  }
+}