build ios directory + rename app.json name and slug

ios/Railbird/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,14 @@
+{
+  "images": [
+    {
+      "filename": "App-Icon-1024x1024@1x.png",
+      "idiom": "universal",
+      "platform": "ios",
+      "size": "1024x1024"
+    }
+  ],
+  "info": {
+    "version": 1,
+    "author": "expo"
+  }
+}

ios/Railbird/Images.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "expo"
+  }
+}

ios/Railbird/Images.xcassets/SplashScreen.imageset/Contents.json

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

ios/Railbird/Images.xcassets/SplashScreenBackground.imageset/Contents.json

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