input: Write a Python function to connect to an SQLite database and create a table for storing tasks. The table should have columns 'id' and 'description'.
  assert create_tasks_table() is None
output: def create_tasks_table():
      import sqlite3
  
      conn = sqlite3.connect('tasks.db')
      cursor = conn.cursor()
  
      cursor.execute('''
          CREATE TABLE IF NOT EXISTS tasks (
              id INTEGER PRIMARY KEY,
              description TEXT NOT NULL
          )
      ''')
  
      conn.commit()
      conn.close()