doc: add build availability info in readme

Author: psadi

README.md

@@ -25,6 +25,12 @@ This repository provides build scripts to create a Universal AppImage for [Ghost
 1. Download the latest AppImage from the [releases](https://github.com/psadi/ghostty-appimage/releases) section.
 2. Follow the installation instructions below to run the AppImage.
 
+## 📦 Builds
+
+1. Ghostty AppImages are available for both x86_64 and aarch64 systems.
+1. Stable builds are based on upstream releases, with minor fixes and patches released as version+1 tags.
+1. Daily nightly builds, based on the upstream tip releases, are available as pre-releases in the [releases](https://github.com/psadi/ghostty-appimage/releases/tag/tip) section.
+
 ## ⚙️ Installation
 
 ### Command Line (Manual)