Update README.md

Updated the readme docs.

Author: dhermanns

README.md

@@ -6,13 +6,27 @@
 This is an iPhone and Apple Watch application to display blood glucose values stored at your nightscout server.
 
 # Description
-This app displays the last 30 Values from your [nightscout](http://www.nightscout.info) [server](https://github.com/nightscout/cgm-remote-monitor):
 
-![Nightguard App](https://github.com/nightscout/nightguard/blob/master/images/nightguard24.jpg)
+Disclaimer!
+Don't use this App for medical decisions. It comes without absolutely no warranty. Use it at your own risk!
+
+Nightguard is an app that displays your blood glucose values from the Nightscout backend.
+
+It is a native iOS App with support for the Apple Watch.
+Features are:
+- Define a range of acceptable blood glucose values.
+- Whenever your values are out of range you will be alerted.
+- You can snooze the alerts all the time and for a defined time period.
+- You can reactivate the alerts all the time.
+- You can activate alerts if the values are rising or falling too fast.
+- The app displays yesterdays values as an overlay chart. This way you have a hint about how your values could behave in the future.
+- Tune your basal rates with the statistics function to overlay different days
 
-A graphical representation is shown on the Apple Watch as well:
+For the alarms to work the app has to be active. So you can enable a screen lock that keeps the app running all night long.
 
-![Nightguard Apple Watch Screenshot](https://github.com/nightscout/nightguard/blob/master/images/nightguardOnWatch.gif)
+Have a look at www.nightscout.info for more information about how to setup your own Nightscout backend.
+
+![Nightguard App](https://github.com/nightscout/nightguard/blob/master/images/nightguard24.jpg)
 
 The dark gray region in the chart marks the values that are between 80 and 180.