Update README.md

Author: willmcgugan

README.md

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 A demonstration and teaching aid for building terminals apps with [Textual](https://github.com/textualize/textual).
 
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 > [!TIP]
 > No hacks were required to make your terminal do this!
 
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+![Textual supports themes](https://github.com/user-attachments/assets/3de1a991-1154-48b4-b547-21f98509f8c4)
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 If you have [uv](https://docs.astral.sh/uv/guides/tools/) installed:
 
 ```