Add README

Author: s0up4200

README.md

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+<p align="center">
+  <img src="Uptaime/Assets.xcassets/AppIcon.appiconset/icon_256.png" alt="Uptaime" width="128">
+</p>
+
+<h1 align="center">Uptaime</h1>
+
+<p align="center">
+  A lightweight macOS menu bar app that monitors Statuspage.io services in real time.
+</p>
+
+## Features
+
+- Monitor any Statuspage.io-compatible service from the menu bar
+- Color-coded status indicators with customizable icon styles
+- Native macOS notifications on status changes
+- Monitors [Claude](https://status.claude.com) and [OpenAI](https://status.openai.com) by default
+
+## Install
+
+Download the latest DMG from [Releases](../../releases).
+
+## Requirements
+
+- macOS 14.0 (Sonoma) or later