Update README.md

Author: Daanvdplas

pop-api/README.md

@@ -21,9 +21,9 @@ applications rather than managing intricate blockchain details.
   error, making troubleshooting and development easier.
 - **Use Cases**:
     - [Fungibles](./src/v0/fungibles/README.md): Interacting and managing fungible tokens.
+    - [Non Fungibles](./src/v0/nonfungibles/README.md): Interacting and managing non fungible tokens.
+    - [Messaging](./src/v0/messaging/README.md): Cross chain rails for interaction with other chains using ISMP & XCM.
     - In development:
-        - Non Fungibles: Interacting and managing non fungible tokens.
-        - Messaging: Cross chain rails for interaction with other chains using ISMP & XCM.
         - Sponsorship: Allowing smart contracts to sponsor transactions.
         - Incentives: Incentivise smart contracts by sharing chain revenue.