renamed introduction to tutorial

docs/examples/app/question03.py

@@ -0,0 +1,38 @@
+from textual.app import App, ComposeResult
+from textual.widgets import Static, Button
+
+
+class QuestionApp(App[str]):
+    CSS = """
+    Screen {
+        layout: table;
+        table-size: 2;
+        table-gutter: 2; 
+        padding: 2;   
+    }
+    #question {
+        width: 100%;
+        height: 100%;
+        column-span: 2;
+        content-align: center bottom;
+        text-style: bold;
+    } 
+
+    Button {
+        width: 100%;
+    }
+    """
+
+    def compose(self) -> ComposeResult:
+        yield Static("Do you love Textual?", id="question")
+        yield Button("Yes", id="yes", variant="primary")
+        yield Button("No", id="no", variant="error")
+
+    def on_button_pressed(self, event: Button.Pressed) -> None:
+        self.exit(event.button.id)
+
+
+app = QuestionApp()
+if __name__ == "__main__":
+    reply = app.run()
+    print(reply)