Add configurations & format source code.

.eslintignore

.eslintrc.cjs

.gitignore

.prettierignore

.prettierrc

.vscode/extensions.json

.vscode/settings.json

LICENSE.md

README.md

package-lock.json

package.json

playwright.config.ts

postcss.config.cjs

prettier.config.cjs

src/app.d.ts

src/app.html

src/routes/+layout.svelte

src/routes/+page.svelte

svelte.config.js

tailwind.config.cjs