Added setup code

I18N Commander/DataModel/Setup.cs

@@ -0,0 +1,56 @@
+using DataModel.Database.Common;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace DataModel;
+
+public static class Setup
+{
+    private const string ENV_EF_TOOLING_DATABASE = "ENV_EF_TOOLING_DATABASE";
+    private const string DB_READ_WRITE_MODE = "ReadWrite";
+    private const string DB_READ_WRITE_CREATE_MODE = "ReadWriteCreate";
+
+    /// <summary>
+    /// Tries to migrate the data file.
+    /// </summary>
+    public static async Task PerformDataMigration(DataContext dbContext)
+    {
+        var pendingMigrations = (await dbContext.Database.GetPendingMigrationsAsync()).ToList();
+        foreach (var pendingMigration in pendingMigrations)
+        {
+            Console.WriteLine($"The migration '{pendingMigration}' is pending.");
+        }
+
+        await dbContext.Database.MigrateAsync();
+    }
+    
+    /// <summary>
+    /// Add the database to the DI system
+    /// </summary>
+    public static void AddDatabase(this IServiceCollection serviceCollection, string path2DataFile, bool createWhenNecessary = true)
+    {
+        serviceCollection.AddDbContext<DataContext>(options => options.UseSqlite($"Filename={path2DataFile};Mode={(createWhenNecessary ? DB_READ_WRITE_CREATE_MODE : DB_READ_WRITE_MODE)}"));
+    }
+
+    /// <summary>
+    /// Sets up the DI & db context ready for the EF tooling.
+    /// </summary>
+    public static IHostBuilder Setup4EFTooling(string[] args)
+    {
+        var dataFile = Environment.GetEnvironmentVariable(ENV_EF_TOOLING_DATABASE);
+        if (string.IsNullOrWhiteSpace(dataFile))
+        {
+            Console.WriteLine("In order to use EF tooling, point the environment variable ENV_EF_TOOLING_DATABASE to the data file, which should be used for the EF tooling.");
+            Environment.Exit(100);
+        }
+        
+        var builder = Host.CreateDefaultBuilder(args);
+        builder.ConfigureServices((hostContext, serviceCollection) =>
+        {
+            serviceCollection.AddDbContext<DataContext>(options => options.UseSqlite($"Filename={dataFile};Mode=ReadWriteCreate"));
+        });
+
+        return builder;
+    }
+}