Add project files.

SqliteBackups/Interfaces/IBackupRoutines.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SqliteBackups.Interfaces
+{
+    public interface IBackupRoutines
+    {
+        void BackupSqliteDb(string fromDb, string toDb);
+    }
+}