update build instructions

README.md

@@ -105,16 +105,32 @@ A simple and user-friendly Matrix client made with Flutter and the Matrix Dart S
 
 Fork and clone the project, then:
 
+### Linux
+
 -   With Nix: Either use direnv, or `nix flake develop`
 -   Without Nix: Install Flutter, Rust, the libsecret dev package for your distro (must be in `PKG_CONFIG_PATH`), and sqlite (must be in `LD_LIBRARY_PATH`).
 
+### Windows
+
+I don't really know... Probably just install Rust, Flutter, and Git.
+
+Get dependencies:
+
+```sh
+flutter pub get
+```
+
 Build generated files, and watch for new changes:
 
 ```sh
 flutter pub run build_runner watch --delete-conflicting-outputs
 ```
 
-Run `flutter run` to run the app.
+Run the app:
+
+```sh
+flutter run
+```
 
 ## Community