added Credits

GoldWars/GoldWars/Assets.xcassets/Credits.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "filename" : "Credits.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

GoldWars/GoldWars/RulesScene.swift

@@ -99,6 +99,14 @@ class RulesScene: SKScene {
                    onButtonPress: { self.image!.texture = SKTexture(imageNamed: "RulesErfolge") }
             )
         )
+        EntityManager.rulesEMInstance.add(
+            Button(name: "Credits",
+                   textureName: "yellow_button13",
+                   text: "Credits",
+                   position: CGPoint(x: self.size.width * 0.1, y: self.size.height * 0.1 - 20),
+                   onButtonPress: { self.image!.texture = SKTexture(imageNamed: "Credits") }
+            )
+        )
         EntityManager.rulesEMInstance.add(Background(size: self.size))
     }