Mention Windows support in README (#40421)

Morrow Shore created 

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.

Change summary

README.md | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

Detailed changes

README.md 🔗 

@@ -9,11 +9,10 @@ Welcome to Zed, a high-performance, multiplayer code editor from the creators of
 
 ### Installation
 
-On macOS and Linux you can [download Zed directly](https://zed.dev/download) or [install Zed via your local package manager](https://zed.dev/docs/linux#installing-via-a-package-manager).
+On macOS, Linux, and Windows you can [download Zed directly](https://zed.dev/download) or [install Zed via your local package manager](https://zed.dev/docs/linux#installing-via-a-package-manager).
 
 Other platforms are not yet available:
 
-- Windows ([tracking issue](https://github.com/zed-industries/zed/issues/5394))
 - Web ([tracking issue](https://github.com/zed-industries/zed/issues/5396))
 
 ### Developing Zed