Update README

Add note about flatpak

README.md

@@ -20,6 +20,7 @@
   - [Install with Brew](#install-with-brew)
   - [Install with Chocolatey](#install-with-choco)
   - [Install with Package Manager](#install-with-package-manager)
+  - [Flatpak Option](#flatpak)
 - [Why Does This Exist](#why)
 - [More Info](#more-info)
 - [Supported OS](#supported-os)
@@ -44,6 +45,9 @@ choco install vscodium
 #### <a id="install-with-package-manager"></a>Install with Package Manager (Linux)
 You can always install using the downloads (deb, rpm, tar) on the [releases page](https://github.com/VSCodium/vscodium/releases), but you can also install using your favorite package manager and get automatic updates. [@paulcarroty](https://github.com/paulcarroty) has set up a repository with instructions [here](https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo). Any issues installing VSCodium using your package manager should be directed to that repository's issue tracker. 
 
+#### <a id="flatpak"></a>Flatpak Option (Linux)
+VSCodium is not available as a Flatpak app, but [@amtlib-dot-dll](https://github.com/amtlib-dot-dll) has done significant work to package up the open source build of Visual Studio Code without telemetry, very similarly to VSCodium. That package is available [here](https://flathub.org/apps/details/com.visualstudio.code.oss) and the build repo is [here](https://github.com/flathub/com.visualstudio.code.oss).
+
 ## <a id="why"></a>Why Does This Exist
 This repository contains a build file to generate FLOSS release binaries of Microsoft's VSCode.