Update README.md

README.md

@@ -11,13 +11,24 @@ yarn dev
 
 Go to `http://localhost:1234`
 
+### Usage
+
+#### Background Selection
+Select the background colour of your sprite sheet so that trimming works as expected.
+
+#### Exporting a Single Sprite
+Click on a sprite, check the preview and click export. A `.png` file will be downloaded.
+
+#### Exporting Multiple Sprites
+Click on a sprite, hold shift to select another sprite, and another, and another. Click export. A `.zip` file will be downloaded.
+
 ### Todo
 - [x] Export individual selected sprites as PNG
 - [x] Preview panel for selected sprite
 - [ ] Zoom in/out
 
 ### Ideas
 - [ ] Right-click to export
-- [ ] Shift to select multiple sprites and export all
+- [x] Shift to select multiple sprites and export all
 - [ ] Adjustable rectangle after selection
 - [ ] Grid-based slicing