[DB] DbContext relations

DotBased.AspNet.Authority.EFCore/README.md

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+# EF Core database
+
+## Add migration project
+```csharp
+options.UseSqlite("Data Source=dev-dotbased.db", c => c.MigrationsAssembly("PROJECT-NAME"));
+```
+
+## EF Tool
+
+Add migration
+```shell
+dotnet ef migrations add MIGRATION-NAME --project PROJECT-NAME
+```
+
+Remove migrations
+```shell
+dotnet ef migrations remove --project PROJECT-NAME
+```
+
+Update database
+```shell
+dotnet ef database update --project PROJECT-NAME
+```