Project: svelte
Task (challenging): 1) Create components/Tooltip.svelte that displays a tooltip (.tooltip) at the bottom of the child component when hovered over. 2) Implement this tooltip on the 'Add Blog' button to show 'Write a New Blog For everyone' when hovered. 3) The Tooltip should be appended to document.body using Portal. 4) Constraint: DO NOT use any third-party packages; ONLY Svelte APIs are allowed.