Update Green Donut link (#361)

Author: glen-84

README.md

@@ -618,7 +618,7 @@ Listed in alphabetical order
   - [java-dataloader](https://github.com/graphql-java/java-dataloader)
 - .Net
   - [GraphQL .NET DataLoader](https://graphql-dotnet.github.io/docs/guides/dataloader/)
-  - [GreenDonut](https://github.com/ChilliCream/greendonut)
+  - [Green Donut](https://github.com/ChilliCream/graphql-platform?tab=readme-ov-file#green-donut)
 - Perl
   - [perl-DataLoader](https://github.com/richardjharris/perl-DataLoader)
 - PHP