Add note on README re: windows and images

README.md

@@ -112,14 +112,16 @@ _presenterm_ with the `sixel` feature flag, which is disabled by default. You ca
 cargo build --release --features sixel
 ```
 
-> **Note**: this feature flag is only needed if your terminal emulator only supports sixel. many terminals support the kitty or iterm2 protocols so this isn't necessary.
+> **Note**: this feature flag is only needed if your terminal emulator only supports sixel. Many terminals support the kitty or iterm2 protocols so this isn't necessary.
 
 Images are rendered **in their default size**. This means if your terminal window is 100 pixels wide and your image is 
 50 pixels wide, it will take up 50% of the width. If an image does not fit in the screen, it will be scaled down to fit 
 it.
 
 ![](assets/demo-image.png)
 
+> **Note**: image rendering is currently not supported on Windows.
+
 ## Themes
 
 _presenterm_ supports themes so you can customize your presentation's look. See the [built-in themes](themes) as