Update README.md (#102)

* Update README.md

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: JohntheLi

README.md

@@ -46,6 +46,16 @@ A correct implementation would look like https://poe.com/PromptBotDemo
 
 A correct implementation would look like https://poe.com/WrapperBotDemo
 
+### SDXLBot
+
+- This bot demonstrates how to wrap an image generation endpoint.
+- It uses Fireworks AI's StableDiffusionXL endpoint. You will need to provide your own
+  key for this.
+- Alternatively, you can change the URL to point at a different provider or model.
+- To deploy, run `modal deploy sdxl_bot.py`
+
+A correct implementation would look like https://poe.com/StableDiffusionXL
+
 ### CatBot
 
 - A sample bot that demonstrates the Markdown capabilities of the Poe API.