docs: add discord and matrix badges

README.md

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 # tree-sitter
 
 [![DOI](https://zenodo.org/badge/14164618.svg)](https://zenodo.org/badge/latestdoi/14164618)
+[![discord][discord]](https://discord.gg/w7nTvsVJhm)
+[![matrix][matrix]](https://matrix.to/#/#tree-sitter-chat:matrix.org)
 
 Tree-sitter is a parser generator tool and an incremental parsing library. It can build a concrete syntax tree for a source file and efficiently update the syntax tree as the source file is edited. Tree-sitter aims to be:
 
@@ -10,8 +12,10 @@ Tree-sitter is a parser generator tool and an incremental parsing library. It ca
 - **Dependency-free** so that the runtime library (which is written in pure C) can be embedded in any application
 
 ## Links
-
 - [Documentation](https://tree-sitter.github.io)
 - [Rust binding](lib/binding_rust/README.md)
 - [WASM binding](lib/binding_web/README.md)
 - [Command-line interface](cli/README.md)
+
+[discord]: https://img.shields.io/discord/1063097320771698699?logo=discord&label=discord
+[matrix]: https://img.shields.io/matrix/tree-sitter-chat%3Amatrix.org?logo=matrix&label=matrix