docs(README): restore inline quickstart comments

Author: tony

README.md

@@ -85,14 +85,17 @@ Create and drive a tmux session entirely from Python.
 import libtmux
 import time
 
+# Connect to tmux (starts one if not running)
 server = libtmux.Server()
+# Unique name avoids collisions on repeated runs
 session_name = f"libtmux-demo-{int(time.time())}"
 session = server.new_session(session_name=session_name, window_name="workspace")
 
 window = session.active_window
 left = window.active_pane
 right = window.split_window(vertical=True)
 
+# Send commands to panes
 left.send_keys("vim", enter=True)
 right.send_keys("htop", enter=True)