feat: add-rust-provider-documentation (#1321)

## This PR
Adds Flagsmith rust provider to the ecosystem list

### Related Issues
Dependent on open-feature/rust-sdk-contrib#82

Signed-off-by: wadii <wadii.zaim@flagsmith.com>

Author: Zaimwa9

src/datasets/providers/flagsmith.ts

@@ -47,5 +47,11 @@ export const Flagsmith: Provider = {
       href: 'https://github.com/Flagsmith/flagsmith-openfeature-provider-python',
       category: ['Server'],
     },
+    {
+      technology: 'Rust',
+      vendorOfficial: true,
+      href: 'https://github.com/open-feature/rust-sdk-contrib/tree/main/crates/flagsmith',
+      category: ['Server'],
+    },
   ],
 };