Document keyboard shortcuts for bpmn_io

docs/modeller/bpmn/bpmn_io/usage.md

@@ -22,3 +22,21 @@ title: Usage
    - **Documentation**:
 
 4. Click *Save*.
+
+## Keyboard Shortcuts
+
+When the focus is inside the BPMN canvas, there is support for the following shortcuts:
+
+| Function       | Shortcut      |
+|----------------|---------------|
+| Undo           | ctrl + Z      |
+| Redo           | ctrl + Y      |
+| Select All     | ctrl + A      |
+| Copy           | ctrl + C      |
+| Paste          | ctrl + V      |
+| Find           | ctrl + F      |
+| Scrolling      | ctrl + Arrows |
+| Direct Editing | E             |
+| Hand Tool      | H             |
+| Lasso Tool     | L             |
+| Space Tool     | S             |