Update README.md

Author: gustavnavar

README.md

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+# Grid.Core
+
+GridCore is a back-end library for Spring Boot projects that performs paging, sorting, filtering and others, to support client Blazor projects to show data in a grid. 
+
+It is in development and it is not production ready.
+
+The long-term objective is to develop a client Grid library for Vue.js projects.
+
+
+## Folder description
+* [gridcore](./gridcore): Library to build back-ends bases on Spring Boot
+* [demo](./demo): Spring Boot demo project supporting the gridcore library. It can be testes with this [Blazor WASM project](https://github.com/gustavnavar/Grid.Blazor/tree/master/GridBlazorSpring)
+
+The SQL Server database for all demos can be downloaded from [here](./sample-database)
+
+Alternatively, if you prefer to install a fresh version of the database you can perform the following steps:
+- run this script from Microsoft web to create a new database: https://github.com/microsoft/sql-server-samples/blob/master/samples/databases/northwind-pubs/instnwnd.sql
+- add a column to the Customers table with the name IsVip of type bit (NOT NULL) and default value 0:
+    ```sql
+        USE Northwind;
+        ALTER TABLE dbo.Customers ADD IsVip bit NOT NULL DEFAULT 0 WITH VALUES;
+        GO
+    ```
+- change manually some values of the new IsVip column to True
+- review the datetime columns. Any mismatch between EF Core model and database definitions will produce an exception and filtering will not work as expected. If database columns are defined as ```datetime``` you must modify the ```NorthwindDbContext``` class including:
+    ```c#
+        modelBuilder.Entity<Order>().Property(r => r.OrderDate).HasColumnType("datetime");
+    ```
+    for each datetime column. Or you can change all database columns' type to ```datetime2(7)```.
+