Added migration commands

I18N Commander/DataModel/cmdAddMigration.cmd

@@ -0,0 +1,4 @@
+@echo off
+set /p migrationName="Please enter the new migration's name: "
+dotnet tool update --global dotnet-ef
+dotnet ef migrations add %migrationName%

I18N Commander/DataModel/cmdUndoMigration.cmd

@@ -0,0 +1,4 @@
+@echo off
+set /p migrationName="Please enter the migration's name which should be the **ACTIVE** one: "
+dotnet tool update --global dotnet-ef
+dotnet ef database update %migrationName%