Added readme.tanghus

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+As I like to run regular, automated backups of my PIM data I looked into an 
+easy way of getting the direct link to an address book, and noticed the 
+elegant way it was possible in the calendar, where you can click on the 
+'Calendars' button and download it directly.
+I modified the export.php script for the contacts app and can now run backups 
+with wget and http authentication. Hence the name 'tanghus_remote_backup' for
+this branch.
+Then I implemented the nice popup window function to get an UI for it and one 
+thing lead to another: 
+
+As for the Calendar app there's a js popup for address book activation, CardDAV link, export, 
+edit, delete and add address books.
+
+When making changes to the address books the contact list is updated to show the
+contacts in the active address book(s).
+
+When an address book is activated the setting is saved using OC_Preferences::setValue().
+
+Most of the code is copy/paste from the Calendar and Contacts apps ;-)
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