Update README.md

Author: bafu

README.md

@@ -24,6 +24,7 @@ Numbers Network is dedicated to preserving digital media provenance and related
     - [Check Minting Amount](#check-minting-amount)
   - [Precompile: Configuring dynamic fees](#precompile-configuring-dynamic-fees)
   - [Precompile: Restricting Smart Contract Deployers](#precompile-restricting-smart-contract-deployers)
+  - [Interoperability](#interoperability)
   - [Admin](#admin)
     - [Confirm Updated Node Is Working](#confirm-updated-node-is-working)
     - [Confirm Node Is Working](#confirm-node-is-working)
@@ -614,6 +615,10 @@ BigNumber { value: "1" }
 
 Check the [official doc](https://docs.avax.network/subnets/customize-a-subnet#restricting-smart-contract-deployers) for the details.
 
+## Interoperability
+
+[Overview](https://ava-labs-preview-4bd33b78-6a2a-400d-a6ba-4df588ac1831.docs.buildwithfern.com/portal/interoperability/overview)
+
 ## Admin
 
 [avalanchego-api-scripts](https://github.com/numbersprotocol/avalanchego-api-scripts) is the admin toolkit.