Add Shifter (#3690)

Add Shifter to File Transfer section.

README.md

@@ -983,6 +983,7 @@ Simplified file servers for sharing of one-time/short-lived/temporary files, pro
 - [QuickShare](https://github.com/ihexxa/quickshare) - Quick and simple file sharing between different devices. `LGPL-3.0` `Go`
 - [Share](https://github.com/MrDemonWolf/share) - Simple yet advanced uploader - upload files, images and text with moderation tools for admins. Can be used for friends and family or just for you. Integration with ShareX and more. `MIT` `Nodejs`
 - [Sharry](https://github.com/eikek/sharry) - Share files easily over the internet between authenticated and anonymous users (both ways) with resumable up- and downloads. `GPL-3.0` `Scala/Java`
+- [Shifter](https://github.com/TobySuch/Shifter) - A simple, self-hosted file-sharing web app, powered by Django. `MIT` `Docker`
 - [Snapdrop](https://snapdrop.net/) - Local file sharing in your browser. Inspired by Apple's Airdrop. ([Source Code](https://github.com/RobinLinus/snapdrop)) `GPL-3.0-only` `Docker`
 - [transfer.sh](https://transfer.sh) - Easy file sharing from the command line. ([Source Code](https://github.com/dutchcoders/transfer.sh)) `MIT` `Go`
 - [Uguu](https://uguu.se/) - Stores files and deletes after X amount of time. ([Source Code](https://github.com/nokonoko/uguu)) `MIT` `PHP`