Create simple terminal and buffer abstractions

examples/hello_world.rs

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+use std::io;
+
+use crossterm::style::{ContentStyle, Stylize};
+use toss::buffer::Pos;
+use toss::terminal::Terminal;
+
+fn main() -> io::Result<()> {
+    // Automatically enters alternate screen and enables raw mode
+    let mut term = Terminal::new(Box::new(io::stdout()))?;
+
+    // Must be called before rendering, otherwise the terminal has out-of-date
+    // size information and will present garbage.
+    term.autoresize()?;
+
+    // Render things to the buffer
+    let b = term.buffer();
+    b.write(
+        Pos::new(0, 0),
+        "Hello world!",
+        ContentStyle::default().green(),
+    );
+    b.write(
+        Pos::new(0, 1),
+        "Press any key to exit",
+        ContentStyle::default().on_dark_blue(),
+    );
+
+    // Show the buffer's contents on screen
+    term.present()?;
+
+    // Wait for input before exiting
+    let _ = crossterm::event::read();
+
+    Ok(())
+}