Add a Vue Apollo example

[cilice]

Closes #141

I had some freedom the pick some kind of a mocking client for apollo since vue-apollo doesn't provide one. I also used screen, is that alright or should i redo it using the destructing approach used everywhere else?

[codecov[bot]]

Codecov Report

Merging #143 into master will not change coverage. The diff coverage is n/a.

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  Hits            69        69           

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[cilice]

I guess I should also add a note this is only for Apollo v2 and will not work with Apollo v3.

[cilice]

Things I've changed now:

• clarified the setup
• added some remarks about apollo-client v2
• added a loading example and added some comments around the needed await for data to appear, since fetching is async

I think this PR is in a good state now, feel free to merge. 🙌 ✨

[afontcu]

@cilice I think this comment went out the minute you pushed, you might have missed it xD

https://github.com/testing-library/vue-testing-library/pull/143#discussion_r429185365

[cilice]

Oh thats neat, it somehow never crossed my mind to solve it like this. It's great! I've changed it now and squashed it all into one commit.

[cilice]

@afontcu I think it’s ready to merge 🙏

[afontcu]

:tada: This PR is included in version 5.0.4 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: