Add example with all text styles.

docs/examples/styles/text_style_all.py

@@ -0,0 +1,28 @@
+from textual.app import App
+from textual.containers import Grid
+from textual.widgets import Label
+
+TEXT = """I must not fear.
+Fear is the mind-killer.
+Fear is the little-death that brings total obliteration.
+I will face my fear.
+I will permit it to pass over me and through me.
+And when it has gone past, I will turn the inner eye to see its path.
+Where the fear has gone there will be nothing. Only I will remain."""
+
+
+class AllTextStyleApp(App):
+    def compose(self):
+        yield Grid(
+            Label("none\n" + TEXT, id="lbl1"),
+            Label("bold\n" + TEXT, id="lbl2"),
+            Label("italic\n" + TEXT, id="lbl3"),
+            Label("reverse\n" + TEXT, id="lbl4"),
+            Label("strike\n" + TEXT, id="lbl5"),
+            Label("underline\n" + TEXT, id="lbl6"),
+            Label("bold italic\n" + TEXT, id="lbl7"),
+            Label("reverse strike\n" + TEXT, id="lbl8"),
+        )
+
+
+app = AllTextStyleApp(css_path="text_style_all.css")