add AdGuard Home Remote docs

doc/ADMIN.md

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+[Read the apps guide.](APPS.md)

doc/APPS.md

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+# Apps documentation
+
+## Android
+
+To be completed by someone who uses an Android app
+
+## Apple devices
+
+### AdGuard Home Remote
+
+[AdGuard Home Remote](https://apps.apple.com/app/id1543143740) by [RocketScience IT](https://rocketscience-it.nl/) is compatible with Mac, iPhone, iPad and Watch.  
+It is free with an in-app purchase of 6€ or US$5 to unlock some features. No ads, no tracking.
+
+You can easilly configure it:
+
+- Add Instance
+- Choose a display name
+- Write your AdGuard Home domain name, here `adguard.example.com` as an example
+- Pick `https`, this will automatically fill the port field with `443`
+- Enter your AdGuard Home credentials in the "Authentication" fields
+- Test the connection, if a green check is showed up, you're alright
+
+![A screenshot showing the previous instructions completed in the app](screenshots/apps/AGH-remote.PNG)