add textual app skeleton

src/chore_manager/main.py

@@ -1,3 +1,5 @@
-
+from .tui import ChoreManagerTui
 def main_tui() -> None:
-    print("Hello World")
+    app = ChoreManagerTui()
+    app.run()
+

src/chore_manager/tui.py

@@ -0,0 +1,9 @@
+from textual.app import App, ComposeResult
+from textual.widgets import Header
+
+
+class ChoreManagerTui(App):
+    
+
+    def compose(self) -> ComposeResult:
+        yield Header()