Enhance README with detailed features, updated screenshots, and project notes; clarify app functionality and requirements.

Author: lulkebit

README.md

@@ -1,26 +1,47 @@
 # Speed
 
-Speed is a lightweight macOS menu bar app for quick network checks without leaving the menu bar.
+Speed is a lightweight macOS menu bar app for running quick network checks without leaving the menu bar.
+
+It uses Apple's native `networkQuality` tool and keeps the results easy to scan, easy to compare, and close at hand.
 
 ## Preview
 
+### Menu bar popover
+
 ![Speed menu bar popover](docs/images/menu-popover.png)
 
-![Speed settings window](docs/images/settings-window.png)
+### Settings overview
+
+![Speed settings overview](docs/images/settings-window-overview.png)
+
+### History and charts
+
+![Speed history and charts](docs/images/settings-window-history.png)
 
-## What It Does
+## Features
 
 - Runs native macOS speed tests with `networkQuality`
-- Shows download, upload, latency, and responsiveness in a compact popover
-- Includes settings for launch at login and automatic test intervals
+- Shows download, upload, ping, and responsiveness in a compact popover
+- Stores measurement history locally and shows charts for 24 hours, 7 days, and 30 days
+- Lists recent measurements for quick comparisons
+- Supports automatic tests on a fixed interval
+- Can automatically run a fresh test after a detected network change
+- Lets you choose what the menu bar shows: icon only, download, ping, or download + upload
+- Supports launch at login
+- Includes built-in update checks and in-app update installation from GitHub releases
+- Supports English and German
+
+## Requirements
+
+- macOS 14 or newer
 
 ## Download
 
 Download the latest build from [Releases](../../releases).
 
 1. Download the newest `SpeedMenuBar-...-macOS.zip`
 2. Move `SpeedMenuBar.app` to `/Applications`
-3. Open the app from Applications and run tests from the menu bar
+3. Open the app from Applications and start tests from the menu bar
 
 Note: release builds are currently ad-hoc signed and not notarized, so macOS may ask you to confirm the first launch.
 
@@ -32,6 +53,12 @@ swift test
 open dist/SpeedMenuBar.app
 ```
 
+## Project Notes
+
+- Speed runs as a menu bar app and does not appear in the Dock
+- Measurement history is stored locally on the Mac
+- Automatic retests on network change are enabled from Settings
+
 ## Contributing
 
 See [CONTRIBUTING.md](CONTRIBUTING.md).