input: Write a python function to create a simple login page using tkinter.
  assert isinstance(create_login_page(), Tk)
  assert create_login_page().title() == "Login Page"
output: def create_login_page():
      import tkinter as tk
      from tkinter import Tk, Label, Entry, Button
  
      root = Tk()
      root.title("Login Page")
  
      Label(root, text="Username:").grid(row=0, column=0)
      Entry(root).grid(row=0, column=1)
  
      Label(root, text="Password:").grid(row=1, column=0)
      Entry(root, show='*').grid(row=1, column=1)
  
      Button(root, text="Login").grid(row=2, column=0, columnspan=2)
  
      return root