Update README, add screenshots.

README.md

@@ -3,19 +3,31 @@
 A standalone dashboard page showing the status of the checks in your Healthchecks.io
 account.
 
-* single page, no external dependencies
-* plain HTML, JS and CSS. Fork and hack on it – no build tools or dev environment needed
-* auto-refreshes every 5 minutes
-* can display checks from multiple projects
-* uses Healthchecks.io read-only API keys, does not expose ping URLs
+[See a live example dashboard here](https://cuu508.github.io/).
+
+* Single page, no external dependencies.
+* Plain HTML, JS and CSS. Fork it and hack on it – no build tools or dev environment needed.
+* Live-updates every 5 seconds.
+* Can display checks from multiple projects.
+* Uses Healthchecks.io read-only API keys, does not expose ping URLs.
+
+
+## Dark Theme
+
+![Dark THeme](/docs/theme-dark.png?raw=true "Dark Theme")
+
+## Light Theme
+
+![Light THeme](/docs/theme-light.png?raw=true "Light Theme")
+
 
 ## How To Use
 
-* fork the repository
-* edit `index.html` and replace the API keys in `<h1>` tags
-* optionally, you can tweak the colors, font sizes and layout
-* put the `index.html` file on a web server (Github pages, S3 bucket,
-Netlify, ...), or simply open it as a local file in your browser
+* Fork the repository.
+* Edit `index.html` and replace the API keys in `<h1>` tags.
+* Optionally, you can tweak the colors, font sizes and layout.
+* Out the `index.html` file on a web server (Github pages, S3 bucket.
+Netlify, ...), or simply open it as a local file in your browser.