Add Send to Peer-To-Peer Filesharing.

This is basically a fork of Mozilla's Firefox Send thats now discontinued/archived, just without the branding and everything. It was made as a community effort to keep Firefox Send alive in a way. So you can legally self-host it. A friend recommended this to me, so i felt like it's appropriate to add it back into Awesome-Selfhosted. Hope this is acceptable.

README.md

@@ -721,6 +721,7 @@ See https://github.com/n1trux/awesome-sysadmin#distributed-filesystems
 - [cloud-torrent](https://github.com/jpillora/cloud-torrent) - Torrent Web Client with HTTP retrievable or streamable downloaded files. `AGPL-3.0` `Go`
 - [Dat Project](https://datproject.org) - Powerful decentralized file sharing applications built from a large ecosystem of modules. ([Source Code](https://github.com/datproject)) `MIT` `Nodejs`
 - [FilePizza](http://file.pizza/) - Peer-to-peer file transfers in your browser. ([Source Code](https://github.com/kern/filepizza)) `BSD-3-Clause` `Nodejs`
+- [Send](https://gitlab.com/timvisee/send) - A file sharing experiment which allows you to send encrypted files to other users. `MPL-2.0` `JavaScript`
 - [instant.io](https://github.com/feross/instant.io) - Streaming file transfer over WebTorrent. ([Demo](https://instant.io)) `MIT` `Nodejs`
 - [Magnetico](https://github.com/boramalper/magnetico) - Magnetico is the first autonomous (self-hosted) BitTorrent DHT search engine suite that is designed for end-users. `AGPL-3.0` `Python`
 - [Magnetissimo](https://github.com/sergiotapia/magnetissimo) - Search engine that indexes all popular torrent sites. `MIT` `Elixir`