docs: update README.md

Author: mhanberg

README.md

@@ -5,6 +5,7 @@
 # Overview
 
 [![Discord](https://img.shields.io/badge/Discord-5865F3?style=flat&logo=discord&logoColor=white&link=https://discord.gg/nNDMwTJ8)](https://discord.gg/6XdGnxVA2A)
+![GitHub Discussions](https://img.shields.io/github/discussions/elixir-tools/discussions)
 
 `elixir-tools.nvim` provides a nice experience for writing Elixir applications with [Neovim](https://github.com/neovim/neovim).