add pronunciation to README (#5336)

## Summary

Adds an IPA pronunciation to the very top of the README, for the sake of
clarity. This is a minor thing, but it's nice to know that there's a
'standard' pronunciation for uv.

I have no idea whether this will seem like a "reasonable" place to put
this; I looked over the README and didn't see any obviously more
appropriate places to put it. Maybe this is unobtrusive enough that it's
fine where it is; maybe there should be a new section added somewhere;
maybe somebody who has a better feel for the project goals will have a
clever suggestion.

Closes #5309

---------

Co-authored-by: Zanie Blue <contact@zanie.dev>

README.md

@@ -284,6 +284,16 @@ We are passionate about supporting contributors of all levels of experience and
 you get involved in the project. See the
 [contributing guide](https://github.com/astral-sh/uv/blob/main/CONTRIBUTING.md) to get started.
 
+## FAQ
+
+#### How do you pronounce uv?
+
+It's pronounced as "you - vee" ([`/juː viː/`](https://en.wikipedia.org/wiki/Help:IPA/English#Key))
+
+#### How should I stylize uv?
+
+Just "uv", please. See the [style guide](./STYLE.md#styling-uv) for details.
+
 ## Acknowledgements
 
 uv's dependency resolver uses [PubGrub](https://github.com/pubgrub-rs/pubgrub) under the hood. We're