add a get it on fdroid badge

Author: jrpie

README.md

@@ -4,8 +4,9 @@ _Disclaimer: This app is not related to the [Quod Erat Demonstrandum e.V.](https
 ## Installation
 You can find the most recent release and pre-release APKs under the [Releases](https://github.com/jbb01/qed/releases) tab.
 
-<a href="https://apps.obtainium.imranr.dev/redirect?r=obtainium://app/{%22id%22:%22eu.jonahbauer.qed%22,%22url%22:%22https://github.com/jbb01/qed%22,%22author%22:%22Jonah%20Bauer%22,%22name%22:%22QED%22,%22additionalSettings%22:%22{\%22about\%22:\%22The%20app%20bundles%20the%20chat,%20gallery%20and%20database%20into%20one%20very,%20very%20good%20app.%20Disclaimer:%20This%20app%20is%20not%20related%20to%20the%20Quod%20Erat%20Demonstrandum%20e.V.%20in%20any%20official%20way.\%22}%22}"><img src="https://raw.githubusercontent.com/ImranR98/Obtainium/b1c8ac6f2ab08497189721a788a5763e28ff64cd/assets/graphics/badge_obtainium.png" alt="Get it on Obtainium" height="80"></a>
 <a href="https://github.com/jbb01/QED/releases/latest"><img src="https://raw.githubusercontent.com/NeoApplications/Neo-Backup/034b226cea5c1b30eb4f6a6f313e4dadcbb0ece4/badge_github.png" alt="Get it on GitHub" height="80"></a>
+<a href="https://f-droid.org/packages/eu.jonahbauer.qed.fdroid/"><img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="80"></a>
+<a href="https://apps.obtainium.imranr.dev/redirect?r=obtainium://app/{%22id%22:%22eu.jonahbauer.qed%22,%22url%22:%22https://github.com/jbb01/qed%22,%22author%22:%22Jonah%20Bauer%22,%22name%22:%22QED%22,%22additionalSettings%22:%22{\%22about\%22:\%22The%20app%20bundles%20the%20chat,%20gallery%20and%20database%20into%20one%20very,%20very%20good%20app.%20Disclaimer:%20This%20app%20is%20not%20related%20to%20the%20Quod%20Erat%20Demonstrandum%20e.V.%20in%20any%20official%20way.\%22}%22}"><img src="https://raw.githubusercontent.com/ImranR98/Obtainium/b1c8ac6f2ab08497189721a788a5763e28ff64cd/assets/graphics/badge_obtainium.png" alt="Get it on Obtainium" height="80"></a>
 
 A [port for iOS](https://www.youtube.com/watch?v=dQw4w9WgXcQ) will be available very soon™!
 
@@ -22,4 +23,4 @@ The app bundles the [chat](https://chat.qed-verein.de), [gallery](https://galler
 <img src="docs/images/people.png" width="1080" height="2100" alt="" style="width: 180px; height: 350px;">
 
 
-[^1]: It is very, very good indeed!
+[^1]: It is very, very good indeed!