Add project files.

LoadStockDbFromTrans/DbConnections/SqliteDbConnectionFactory.cs

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+using Microsoft.Data.Sqlite;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LoadStockDbFromTrans.DbConnections
+{
+    public class SqliteDbConnectionFactory
+    {
+        private string? _connectionString;
+
+        public SqliteDbConnectionFactory(string? connectionString)
+        {
+            _connectionString = connectionString;
+        }
+
+        public IDbConnection Connect()
+        {
+            return new SqliteConnection(_connectionString);
+        }
+    }
+}