Update readme.

README.md

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 # encrypted-dns-configs
-Configuration profiles for DNS HTTPS and DNS over TLS
+Configuration profiles for [DNS over HTTPS](https://en.wikipedia.org/wiki/DNS_over_HTTPS) and [DNS over TLS](https://en.wikipedia.org/wiki/DNS_over_TLS).
+
+Check out the article for more info: [paulmillr.com/posts/encrypted-dns/](https://paulmillr.com/posts/encrypted-dns/).
+
+## Installation
+
+To make settings work across all apps in iOS & MacOS, you’ll need to install configuration profile. This profile would tell operating system to use DOH / DOT. Note: it’s not enough to simply set cloudflare (etc) server IPs in System Preferences — you need to install a profile.
+
+On iOS, after installation, go to system Settings => General => Profile, select downloaded profile and click “Install” button.