dotnet-ef: add page (#6799)

pages/common/dotnet-ef.md

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+# dotnet ef
+
+> Perform design-time development tasks for Entity Framework Core.
+> More information: <https://docs.microsoft.com/ef/core/cli/dotnet>.
+
+- Update the database to a specified migration:
+
+`dotnet ef database update {{migration}}`
+
+- Drop the database:
+
+`dotnet ef database drop`
+
+- List available `DbContext` types:
+
+`dotnet ef dbcontext list`
+
+- Generate code for a `DbContext` and entity types for a database:
+
+`dotnet ef dbcontext scaffold {{connection_string}} {{provider}}`
+
+- Add a new migration:
+
+`dotnet ef migrations add {{name}}`
+
+- Remove the last migration, rolling back the code changes that were done for the latest migration:
+
+`dotnet ef migrations remove`
+
+- List available migrations:
+
+`dotnet ef migrations list`
+
+- Generate a SQL script from migrations range:
+
+`dotnet ef migrations script {{from_migration}} {{to_migration}}`