Create 02_appbar_example.py (#184)

Add new Appbar example

Author: Kevinme789

python/apps/controls-gallery/examples/navigation/appbar/02_appbar_example.py

@@ -0,0 +1,25 @@
+import flet as ft
+
+def example2():
+   pagelet = ft.Pagelet(
+        appbar = ft.AppBar(
+             title=ft.Text("TITLE", color=ft.Colors.WHITE),
+             center_title=False,
+             bgcolor=ft.Colors.BLACK,
+             actions=[
+               ft.TextButton("Category", width=140, icon=ft.icons.CATEGORY, icon_color=ft.Colors.WHITE,
+                          style=ft.ButtonStyle(color=ft.Colors.WHITE,)),
+               ft.TextButton("Recommend", width=200, icon=ft.icons.RECOMMEND, icon_color=ft.Colors.WHITE,
+                          style=ft.ButtonStyle(color=ft.Colors.WHITE,)),
+               ft.TextButton("Popularity", width=140, icon=ft.icons.FAVORITE, icon_color=ft.Colors.WHITE,
+                          style=ft.ButtonStyle(color=ft.Colors.WHITE,)),
+               ft.TextButton("Bads", icon=ft.icons.MOOD_BAD, width=140, icon_color=ft.Colors.WHITE,
+                          style=ft.ButtonStyle(color=ft.Colors.WHITE,)),
+               ft.TextButton("Favorites", width=140, icon=ft.icons.STAR_ROUNDED, icon_color=ft.Colors.WHITE,
+                          style=ft.ButtonStyle(color=ft.Colors.WHITE,)),
+               ft.Text("   ", width=265),
+            ],
+        ),
+       content = ft.Container()
+   )
+   return pagelet