high resolution icon

deltachat-ios/Assets.xcassets/dc_logo.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "dc_icon_1x.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "dc_icon_2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "dc_icon_3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

deltachat-ios/Controller/WelcomeViewController.swift

@@ -113,7 +113,7 @@ class WelcomeContentView: UIView {
     private var container = UIView()
 
     private var logoView: UIImageView = {
-        let image = #imageLiteral(resourceName: "ic_launcher").withRenderingMode(.alwaysOriginal)
+        let image = #imageLiteral(resourceName: "dc_logo")
         let view = UIImageView(image: image)
         return view
     }()