Add description and instructions

README.md

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+# Battery Status
+
+Program that notifies the user when it's time to plug in or unplug the laptop to maximize the battery life
+
+## Installation
+
+### Windows
+
+1. Download and unzip [Battery Status](https://github.com/yehwankim23/battery-status/releases/latest/download/battery-status-windows.zip)
+2. Run `Battery Status Installer.exe`
+3. (Optional) Move the `Battery Status` shortcut on the desktop to the `Startup Folder` folder to run `Battery Status` on computer startup
+
+### macOS
+
+1. Build `Battery Status`
+
+```sh
+git clone https://github.com/yehwankim23/battery-status
+```
+
+```sh
+cd battery-status
+```
+
+```sh
+npm i
+```
+
+```sh
+npm run make
+```
+
+2. Unzip `out/make/zip/darwin/arm64/Battery Status-darwin-arm64-2024.1.0.zip`
+3. Move `Battery Status.app` to the `Applications` folder
+4. (Optional) Add `Battery Status.app` in `System Settings` > `General` > `Login Items` > `+` to run `Battery Status` on computer startup
+5. Run `Battery Status.app`
+6. Allow notifications when the battery level reaches 20% or 80% (or later in `System Settings` > `Notifications`)