feat: Add install instructions to README

Author: feoh

README.md

@@ -1,17 +1,60 @@
-# linkdqueue
+# Linkdqueue
 
-A new Flutter project.
+A reading queue manager for [Linkding](https://github.com/sissbruecker/linkding) bookmarks. Browse your unread bookmarks, filter by tag, mark articles as read, and manage tags — all from a native desktop or mobile app.
 
-## Getting Started
+## Installation
 
-This project is a starting point for a Flutter application.
+Download the latest release for your platform from the [Releases](../../releases) page.
 
-A few resources to get you started if this is your first Flutter project:
+### macOS
 
-- [Learn Flutter](https://docs.flutter.dev/get-started/learn-flutter)
-- [Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
-- [Flutter learning resources](https://docs.flutter.dev/reference/learning-resources)
+1. Download `linkdqueue-macos.zip` and unzip it.
+2. Move `linkdqueue.app` to your `/Applications` folder.
+3. On first launch, right-click the app and choose **Open** to bypass Gatekeeper (required once for apps not from the App Store).
 
-For help getting started with Flutter development, view the
-[online documentation](https://docs.flutter.dev/), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+### Linux
+
+1. Download `linkdqueue-linux.tar.gz` and extract it:
+   ```bash
+   tar -xzvf linkdqueue-linux.tar.gz -C ~/Applications/linkdqueue
+   ```
+2. Install the runtime dependency for secure credential storage:
+   ```bash
+   # Debian / Ubuntu
+   sudo apt install libsecret-1-0
+
+   # Fedora / RHEL
+   sudo dnf install libsecret
+
+   # Arch
+   sudo pacman -S libsecret
+   ```
+3. Run the app:
+   ```bash
+   ~/Applications/linkdqueue/linkdqueue
+   ```
+   Optionally create a desktop shortcut pointing to that path.
+
+### Windows
+
+1. Download `linkdqueue-windows.zip` and unzip it to a folder of your choice (e.g. `C:\Program Files\Linkdqueue`).
+2. Run `linkdqueue.exe` inside that folder.
+3. Optionally right-click `linkdqueue.exe` and choose **Pin to Start** or **Send to > Desktop (create shortcut)**.
+
+## Setup
+
+On first launch you will be prompted for your Linkding connection details:
+
+- **Linkding URL** — the base URL of your Linkding instance (e.g. `https://linkding.example.com`)
+- **API Token** — found in Linkding under **Settings > Integrations**
+
+Use **Test Connection** to verify before saving.
+
+## Features
+
+- Browse your unread bookmark queue with infinite scroll
+- Filter by tag or free-text search
+- Mark bookmarks as read, archive, or delete
+- Edit tags on any bookmark
+- Swipe actions on mobile (mark read, archive)
+- Adjustable text size and colour theme