Add Snowflake provider (#4909)

Author: Sielnix

entity-framework/core/providers/index.md

@@ -61,6 +61,7 @@ Entity Framework Core can access many different databases through plug-in librar
 | [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)                                                                               |
+| [EFCore.Snowflake](https://www.nuget.org/packages/EFCore.Snowflake/)                                                 | Snowflake                                                   | [Krzysztof Sielaff](https://github.com/Sielnix)                                                 |                                                                                 | 8                 | [readme](https://github.com/Sielnix/EFCore.Snowflake/blob/main/README.md)                                                                                               |
 
 ## Adding a database provider to your application