Move solution and projects to src

src/Ryujinx.Ui.Common/App/ApplicationMetadata.cs

@@ -0,0 +1,10 @@
+namespace Ryujinx.Ui.App.Common
+{
+    public class ApplicationMetadata
+    {
+        public string Title { get; set; }
+        public bool   Favorite   { get; set; }
+        public double TimePlayed { get; set; }
+        public string LastPlayed { get; set; } = "Never";
+    }
+}