Add LND test wallet

wallet/Assets.xcassets/ic_backspace.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "ic_backspace.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

wallet/Assets.xcassets/ic_backspace.imageset/ic_backspace.pdf

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