docs: add Codex MCP configuration guide

[kingsword09]

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[spotshare-nick]

Why do you feel that your link to Codex's guide on MCP would be better than just including what to add to their config?

[mcp_servers.chrome-devtools]
command = "npx"
args = ["-y", "chrome-devtools-mcp@latest"]

[spotshare-nick]

diff --git a/README.md b/README.md
index 8c390c6..eab227a 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,18 @@ Go to `Cursor Settings` -> `MCP` -> `New MCP Server`. Use the config provided ab
   using the standard config from above.
 </details>

+<details>
+  <summary>Codex</summary>
+  Follow the <a href="https://github.com/openai/codex/blob/main/docs/advanced.md#model-context-protocol-mcp">configure MCP guide</a>
+  using the standard config below:
+
+  ```yaml
+  [mcp_servers.chrome-devtools]
+  command = "npx"
+  args = ["chrome-devtools-mcp@latest"]
+  ```
+</details>
+
 ### Your first prompt

 Enter the following prompt in your MCP Client to check if everything is working:

[spotshare-nick]

Much better!

[sebastianbenz]

Looks good, one thing to be aware of that this integration won't work on Windows 11 as Codex does not correctly resolve the path for npx: openai/codex#2945

[sebastianbenz]

Thanks a lot!