Add Atomics.pause

[browser-specs-bot]

Close #1533, adding the suggested spec to the list.

Changes to index.json

This update would trigger the following changes in index.json:

Add spec (1)

```json { "url": "https://tc39.es/proposal-atomics-microwait/", "seriesComposition": "full", "shortname": "tc39-atomics-microwait", "series": { "shortname": "tc39-atomics-microwait", "currentSpecification": "tc39-atomics-microwait", "title": "Atomics.pause", "shortTitle": "Atomics.pause", "nightlyUrl": "https://tc39.es/proposal-atomics-microwait/" }, "organization": "Ecma International", "groups": [ { "name": "TC39", "url": "https://tc39.es/" } ], "nightly": { "url": "https://tc39.es/proposal-atomics-microwait/", "status": "Editor's Draft", "alternateUrls": [], "repository": "https://github.com/tc39/proposal-atomics-microwait", "sourcePath": "spec/index.html", "filename": "index.html" }, "title": "Atomics.pause", "source": "spec", "shortTitle": "Atomics.pause", "categories": [ "browser" ], "standing": "good" } ```

Tests

These changes look good! 😎