Add Text widget

src/ui/widgets.rs

@@ -0,0 +1,11 @@
+pub mod text;
+
+use async_trait::async_trait;
+use toss::frame::{Frame, Pos, Size};
+
+#[async_trait]
+pub trait Widget {
+    fn size(&self, frame: &mut Frame, max_width: Option<u16>, max_height: Option<u16>) -> Size;
+
+    async fn render(&self, frame: &mut Frame, pos: Pos, size: Size);
+}