Update README.md

- Add `pip install ninja` option under Windows.
- Add `Wine Crossover.app` unquarantine instructions.

README.md

@@ -29,9 +29,10 @@ Windows:
 On Windows, it's **highly recommended** to use native tooling. WSL or msys2 are **not** required.  
 When running under WSL, [objdiff](#diffing) is unable to get filesystem notifications for automatic rebuilds.
 
-- Install [ninja](https://github.com/ninja-build/ninja/releases) and add it to `%PATH%`.
 - Install [Python](https://www.python.org/downloads/) and add it to `%PATH%`.
   - Also available from the [Windows Store](https://apps.microsoft.com/store/detail/python-311/9NRWMJP3717K).
+- Download [ninja](https://github.com/ninja-build/ninja/releases) and add it to `%PATH%`.
+  - Quick install via pip: `pip install ninja`
 
 macOS:
 ------
@@ -44,6 +45,11 @@ macOS:
   brew install --cask --no-quarantine gcenx/wine/wine-crossover
   ```
 
+After OS upgrades, if macOS complains about `Wine Crossover.app` being unverified, you can unquarantine it using:
+```sh
+sudo xattr -rd com.apple.quarantine '/Applications/Wine Crossover.app'
+```
+
 Linux:
 ------
 - Install [ninja](https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages).