Add iOS blog post (#20752)

source/_posts/2021-12-18-ios-multi-server.markdown

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+---
+title: "Multi-server support in iOS 2021.12"
+description: "Configure multiple servers and easily switch between them."
+date: 2021-12-18 00:00:00
+date_formatted: "December 18, 2021"
+author: Zac West
+author_twitter: zacwest
+categories: Release-Notes
+og_image: /images/blog/2021-12-ios/social.png
+---
+
+![Screenshot of the settings screen showing multiple servers](/images/blog/2021-12-ios/social.png)
+
+Today we're releasing Home Assistant companion app for iOS 2021.12. The big new feature: multiple server support. Find it in the app settings on iOS and Mac. Pro-tip: Swipe with three fingers left, right, or up to quickly switch between servers. [Full release notes.](https://github.com/home-assistant/iOS/releases/tag/release%2F2021.12%2F2021.322)
+
+<a href="https://apps.apple.com/us/app/home-assistant/id1099568401?itsct=apps_box_badge&amp;itscg=30200" style="display:inline-block;width:200px"><img class="download-badge" src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=250x83&amp;releaseDate=1492214400&amp;h=3ef4307fa479838e52fe9bd8bd17913b" alt="Download on the App Store" width="175"></a>
+
+At the State of the Open Home I gave a quick demo, which I have embedded below:
+
+<div class='videoWrapper'>
+<iframe width="560" height="315" src="https://www.youtube.com/embed/6ZMXE5PXPqU?start=7589" frameborder="0" allowfullscreen></iframe>
+</div>