Add lectrn

watchlist-for-activitypub-apps.md

@@ -59,6 +59,8 @@
 
 * :tada: :heavy_check_mark: **[Kroeg](https://puckipedia.com/kroeg)** ([site](https://puckipedia.com/kroeg)): Generic ActivityPub server, with a focus on microblogging style activities `- , Rust` 
 
+* :black_nib: **[lectrn](https://github.com/lectrn/lectrn)** ([site](https://lectrn.com/)): A social network for humans that is free, decentralized, open, and easy to use. `AGPL-3.0, Javascript`
+
 * :tada: :heavy_check_mark: **[Mastodon](https://github.com/tootsuite/mastodon)** ([site](https://joinmastodon.org)): Epic microblogging network with many features and multiple interface layouts to choose from `AGPL-3.0, Ruby`
 
 * :heavy_check_mark: [**Lumen-ap-server**](https://notabug.org/tinyrabbit/lumen-ap-server) ([Fedi account](https://floss.social/@tinyrabbit)): ActivityPub server using Lumen framework `MIT, PHP`