add function

function add() {
var task = document.getElementById('task').value;

```
var todos = get_todos();
todos.push(task);
localStorage.setItem('todo', JSON.stringify(todos));

show();

return false;
```

}

Start by locating the add() entry point shown in the issue and inspect how the task field, get_todos(), localStorage, and show() work together. The issue does not specify the desired behavior beyond adding this function, so confirm the expected result before changing code; done should be verified by adding a task and checking that it is persisted and displayed.

Written by the indexing model from the issue text.