Mention Windows support in README (#40421)

probably a good idea to close the windows issue here
https://github.com/zed-industries/zed/issues/5394 and many other dead
issues.

Release Notes:

- Edited the readme to actually mention Windows.
e1618994c7Morrow Shore committed on 10/16/2025, 8:35:39 PM· committed by GitHubparentc288f9b
1 file changedLine totals unavailable