docs: add fish command to create project (#3176)

Author: tsonglew

src/content/docs/_fragments/cta.mdx

@@ -11,6 +11,11 @@ sh <(curl https://create.tauri.app/sh)
 irm https://create.tauri.app/ps | iex
 ```
 </TabItem>
+<TabItem label="Fish">
+```sh frame=none
+sh (curl -sSL https://create.tauri.app/sh | psub)
+```
+</TabItem>
 <TabItem label="npm">
 ```sh frame=none
 npm create tauri-app@latest