Added FileBaseContext to database providers list (#4215)

Author: dualbios

entity-framework/core/providers/index.md

@@ -40,6 +40,7 @@ NuGet Package
 [Google.Cloud.EntityFrameworkCore.Spanner](https://github.com/cloudspannerecosystem/dotnet-spanner-entity-framework) | Google Cloud Spanner       | [Cloud Spanner Ecosystem](https://github.com/cloudspannerecosystem) | Currently in preview | 6           | [tutorial](https://medium.com/google-cloud/google-cloud-spanner-with-entity-framework-core-2ddd16d2b252)
 [Teradata.EntityFrameworkCore](https://www.nuget.org/packages/Teradata.EntityFrameworkCore/)                         | Teradata Database 16.10 onwards | [Teradata](https://downloads.teradata.com/download/connectivity/net-data-provider-for-teradata) | | 3 | [website](https://www.nuget.org/packages/Teradata.EntityFrameworkCore/)
 [FileContextCore](https://www.nuget.org/packages/FileContextCore/)                                                   | Stores data in files       | [Morris Janatzek](https://github.com/morrisjdev)                    | For development purposes | 3       | [readme](https://github.com/morrisjdev/FileContextCore/blob/master/README.md)
+[FileBaseContext](https://www.nuget.org/packages/FileBaseContext/)                                                   | Store tables in files      | [k.D.g](https://github.com/dualbios)                                | For development purposes | 7       | [readme](https://github.com/dualbios/FileBaseContext/blob/main/README.md)
 [EntityFrameworkCore.SqlServerCompact35](https://www.nuget.org/packages/EntityFrameworkCore.SqlServerCompact35)      | SQL Server Compact 3.5     | [Erik Ejlskov Jensen](https://github.com/ErikEJ/)                   | .NET Framework       | 2           | [wiki](https://github.com/ErikEJ/EntityFramework.SqlServerCompact/wiki/Using-EF-Core-with-SQL-Server-Compact-in-Traditional-.NET-Applications)
 [EntityFrameworkCore.SqlServerCompact40](https://www.nuget.org/packages/EntityFrameworkCore.SqlServerCompact40)      | SQL Server Compact 4.0     | [Erik Ejlskov Jensen](https://github.com/ErikEJ/)                   | .NET Framework       | 2           | [wiki](https://github.com/ErikEJ/EntityFramework.SqlServerCompact/wiki/Using-EF-Core-with-SQL-Server-Compact-in-Traditional-.NET-Applications)
 [EntityFrameworkCore.OpenEdge](https://www.nuget.org/packages/EntityFrameworkCore.OpenEdge/)                         | Progress OpenEdge          | [Alex Wiese](https://github.com/alexwiese)                          |                      | 2           | [readme](https://github.com/alexwiese/EntityFrameworkCore.OpenEdge/blob/master/README.md)