Move source code into "Source" folder

Source/ApplicationServices/DbContexts.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using DataLayer;
+using LibationFileManager;
+
+namespace ApplicationServices
+{
+	public static class DbContexts
+	{
+		/// <summary>Use for fully functional context, incl. SaveChanges(). For query-only, use the other method</summary>
+		public static LibationContext GetContext()
+			=> LibationContext.Create(SqliteStorage.ConnectionString);
+
+		/// <summary>Use for full library querying. No lazy loading</summary>
+		public static List<LibraryBook> GetLibrary_Flat_NoTracking()
+		{
+			using var context = GetContext();
+			return context.GetLibrary_Flat_NoTracking();
+		}
+	}
+}