(EDIT): Edit Readme to reflect Testnet being live (#4)

# What ? 

Updating the readme regarding the testnet as as described
[here](https://www.ithaca.xyz/updates/odyssey#how-do-i-try-out-odyssey)


![image](https://github.com/user-attachments/assets/fda63064-207d-4fb4-a6de-a5b8af5c3eb9)

---------

Co-authored-by: Dan Cline <6798349+Rjected@users.noreply.github.com>

README.md

@@ -27,9 +27,14 @@ 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 Testnet
+
+> [!TIP]
+> [The Odyssey Testnet](https://www.ithaca.xyz/updates/odyssey#odyssey-chapter-1-is-live-on-testnet) is now live on 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.
+Odyssey 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
@@ -48,10 +53,6 @@ To use EOF-enabled foundry, use [forge-eof](https://github.com/paradigmxyz/forge
 
 ### Running Odyssey
 
-> [!WARNING]
->
-> Odyssey does not yet have a running testnet, please use the local development instructions above!
-
 Running Odyssey will require running additional infrastructure for the archival L1 node. These instructions are a guide for
 running the Odyssey OP-stack node only.