An editor menu helper that adds a menu item 'Editor -> Easy Splash Screen/My Menu Option' which shows a simple dialog saying "It worked!" when invoked. It is editor-only code for tooling/UI in the editor.
using Editor;
public static class MyEditorMenu
{
[Menu( "Editor", "Easy Splash Screen/My Menu Option" )]
public static void OpenMyMenu()
{
EditorUtility.DisplayDialog( "It worked!", "This is being called from your library's editor code!" );
}
}