PR: add "@warren-bank/i18next-svelte" to list of supported frameworks

[warren-bank]

URLs:

• https://www.i18next.com/overview/supported-frameworks
• https://github.com/i18next/i18next-gitbook/blob/master/overview/supported-frameworks.md
• https://github.com/warren-bank/js-i18next-svelte

Context:

• recently, I started a SvelteKit project and wanted to use i18next
  • started with the only library on this list for Svelte, but quickly ran into issues
  • so I wrote my own wrapper, and wanted to share