feat: add .NET technology support to MultiProvider (#1281)

Signed-off-by: André Silva <2493377+askpt@users.noreply.github.com>

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## This PR
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This pull request adds support for a new `.NET` MultiProvider to the
list of providers in the `multi-provider.ts` file. The change ensures
that users can now see and access the `.NET` MultiProvider option
alongside existing providers.

Provider additions:

* Added a new `.NET` MultiProvider entry to the `MultiProvider` list in
`src/datasets/providers/multi-provider.ts`, including technology, vendor
status, link, and category information.

Signed-off-by: André Silva <2493377+askpt@users.noreply.github.com>

Author: askpt

src/datasets/providers/multi-provider.ts

@@ -24,5 +24,11 @@ export const MultiProvider: Provider = {
       href: 'https://github.com/open-feature/java-sdk-contrib/tree/main/providers/multiprovider',
       category: ['Server'],
     },
+    {
+      technology: '.NET',
+      vendorOfficial: false,
+      href: 'https://github.com/open-feature/dotnet-sdk/tree/main/src/OpenFeature.Providers.MultiProvider',
+      category: ['Server'],
+    }
   ],
 };