Add F-Droid install information to readme

Author: dkter

README.md

@@ -11,7 +11,22 @@ Well, you already know the weather where you are, don't you? What you *don't* kn
 Through using Elsewhere, you may discover a new place you've never heard of before. Actually, scratch that. I can *guarantee* you will. Almost every day, in fact. The world is huge, and there just isn't enough time to visit every corner of it -- but maybe there's enough time to become aware of more places.
 
 ## Download
-[Download APK](https://github.com/dkter/elsewhere/releases/download/v1.0/Elsewhere.apk)
+Elsewhere targets Android 11.0 and supports Android 5.0 (Lollipop) and newer.
+
+### Google Play Store
+coming soon!
+
+### F-Droid
+Make sure you have the [IzzyOnDroid F-Droid repo](https://apt.izzysoft.de/fdroid/index/) added:
+- Go to F-Droid Settings -> Repositories
+- Tap the plus button in the top right 
+- Add this URL under "Repository address": `https://apt.izzysoft.de/fdroid/repo`
+
+Then, download Elsewhere through F-Droid: 
+https://f-droid.org/packages/me.davidteresi.elsewhere
+
+### APK download
+Alternatively, [click here](https://github.com/dkter/elsewhere/releases/download/v1.0/Elsewhere.apk) to download an APK you can install on your phone.
 
 ## Build
 Get an OpenWeatherMap API key and create a file called `keys.properties` in the root of this repo, then format it like this: