Update readme

Author: johnmathews

readme.md

@@ -1,7 +1,6 @@
-# Gym Timer
+# Timer
 
-A simple gym workout timer web app. Slide to set a duration (up to 5 minutes), start the countdown, and get an audio +
-visual alert when time's up.
+A workout interval timer web app with configurable work/rest durations, rep counts, and preset workouts. Features audio cues (bells, chimes, countdown dings, fanfare), color-coded phases, keyboard shortcuts, and wake lock support.
 
 Built with SvelteKit as a static site, designed for touch interfaces and optimized for mobile/iOS.
 
@@ -27,6 +26,12 @@ Produces static output in `build/`.
 npm run build
 ```
 
+## Lint
+
+```sh
+npm run lint
+```
+
 ## Tests
 
 ```sh
@@ -40,6 +45,18 @@ npm run test:e2e
 npm test
 ```
 
+## Presets
+
+Workout presets are defined in `presets.yml` (name, work seconds, rest seconds, reps). Defaults are compiled into the JS bundle at build time.
+
+At runtime, the app fetches `/presets.yml` from the server. In Docker, mount a directory containing your custom `presets.yml` to `/config/` to override the defaults without rebuilding:
+
+```sh
+docker run -d -p 8080:80 -v /path/to/config:/config ghcr.io/johnmathews/gym-timer:latest
+```
+
+Edit the file on the host and reload the page to pick up changes.
+
 ## Deployment
 
 The app is packaged as a Docker image (nginx serving the static build) and published to GHCR on every push to `main`.
@@ -69,11 +86,13 @@ The app will be available at `http://localhost:8080`.
 ```yaml
 # docker-compose.yml
 services:
- gym-timer:
-  image: ghcr.io/johnmathews/gym-timer:latest
-  ports:
-   - "8080:80"
-  restart: unless-stopped
+  gym-timer:
+    image: ghcr.io/johnmathews/gym-timer:latest
+    ports:
+      - "8080:80"
+    volumes:
+      - /path/to/config:/config  # optional: custom presets.yml
+    restart: unless-stopped
 ```
 
 ```sh