Move SampleSwift project to xplat

Summary: Move SampleSwift project to xplat

Reviewed By: passy

Differential Revision: D8989867

fbshipit-source-id: cfda775ec3919d5c689aaf6846a870a2653c47a6

iOS/SampleSwift/Icons.xcassets/sonarpattern.imageset/Contents.json

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