PyGrid UI - Svelte starter

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Description

Initializes the PyGrid UI Svelte directory. This is just a blank app with a test (PlayWright) and Tailwind support. Includes the Dockerfile.

How has this been tested?

• added a single playwright test which can be run via pnpm test

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the OpenMined Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests