Add matrix invite link

README.md

@@ -3,6 +3,7 @@
 [![](https://img.shields.io/crates/v/sabre-lang.svg)](https://crates.io/crates/sabre-lang)
 [![builds.sr.ht status](https://builds.sr.ht/~garritfra/sabre/commits/ci.yml.svg)](https://builds.sr.ht/~garritfra/sabre/commits/ci.yml?)
 [![docs](https://img.shields.io/badge/docs-mdBook-blue.svg)](https://garritfra.github.io/sabre/latest)
+[![Chat on Matrix](https://img.shields.io/badge/chat-on%20Matrix-green)](https://matrix.to/#/!eaupsjLNPYSluWFJOC:matrix.slashdev.space?via=matrix.slashdev.space)
 
 Sabre is a bullshit-free (©) programming language that gets out of your way.
 It is meant to "just work", without adding unnecessary and bloated language features.
@@ -42,6 +43,10 @@ Documentation is hosted on [GitHub Pages](https://garritfra.github.io/sabre).
 
 See [installation](https://garritfra.github.io/sabre/latest/introduction/installation.html).
 
+## Chat on matrix
+
+[Join here!](https://matrix.to/#/!eaupsjLNPYSluWFJOC:matrix.slashdev.space?via=matrix.slashdev.space)
+
 ## License
 
 This software is licensed under the [Apache-2.0 license](./LICENSE).