docs(svelte): add reference to typescript

[camjackson]

I currently have this PR open in svelte-jester to make it a bit clearer how to get svelte-testing-library to play nice with TypeScript.

Assuming that that gets merged (or something like it), I thought it would be good to add a reference to TypeScript here in the testing-library docs, just so the breadcrumbs are a little easier to follow for a newbie setting up svelte-testing-library who is also using TypeScript. That's what this PR does 🙂

[kentcdodds]

👍👍

[kentcdodds]

Ah, could you resolve the conflicts here please?

[camjackson]

Oh, um, the merge conflict was actually with someone else who had the same idea. #542 added added inline instructions for how to get typescript to work, but they're a bit incomplete based on the discussion we had over in the svelte-jester issues.

So to resolve the conflict what I've done is remove the specific instructions that were added here in #542, and replaced them with just a reference to go and read the svelte-jester docs, seeing as those are more complete and will hopefully stay up to date with any changes to svelte-jester.

I feel a little bit bad for deleting work that someone else just did, but I feel like this is a better solution. Happy to discuss 🙂

[mihar-22]

Looks good and as discussed I think this is much better. Thanks for all your help again :)

[mihar-22]

@all-contributors please add @camjackson for docs

[allcontributors]

@mihar-22

I've put up a pull request to add @camjackson! 🎉