Update Readme

- Testnet being as descibed in the official annoncement

README.md

@@ -27,9 +27,13 @@ Odyssey has 2 goals:
 Odyssey's node extensions were chosen for their ability to enable applications that enhance the onchain user experience, and
 drastically reduce cost for existing applications that improve UX.
 
+### Odyssey Test Net
+
+[Testnet](https://www.ithaca.xyz/updates/odyssey#odyssey-chapter-1-is-live-on-testnet) is now live Sepolia and is built with Reth, the OP Stack, and [deployed on Conduit](https://app.conduit.xyz/published/view/odyssey).
+
 ### Odyssey Local Development
 
-Odyssey does not yet have a running testnet, but can be run locally for development and testing purposes. To do this, the binary can be run with the `--dev` flag, which will start the node with a development configuration.
+ Can be run locally for development and testing purposes. To do this, the binary can be run with the `--dev` flag, which will start the node with a development configuration.
 
 First, odyssey should be built locally:
 ```bash