Add Snippet 393 to Snippets.md list

Author: vogella

examples/org.eclipse.swt.snippets/Snippets.md

@@ -148,6 +148,7 @@ To contribute a new snippet, [create a snippet contribution as a pull request](h
 - [map from control-relative to display-relative coordinates](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet276.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet276.png "Preview for Snippet 276")
 - [use application menu bar, if platform supports it](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet347.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet347.png "Preview for Snippet 347")
 - [more complex example using application menu bar to provide better platform behavior](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet348.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet348.png "Preview for Snippet 348")
+- [demonstrate how to request a dark theme for native components (title bars, scrollbars, and native dialogs)](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet393.java)
 
 ### **Drag and Drop**
 - [drag text between two labels](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet78.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet78.png "Preview for Snippet 78")