add READMEs and tie them together in main README

README.md

@@ -3,6 +3,12 @@
 
 A backup application for the [Android Open Source Project](https://source.android.com/).
 
+## Components
+
+* [Local Contacts Backup](contactsbackup) - an app that backs up local on-device contacts
+* [Storage library](storage) - a library handling efficient backup of files
+* [Seedvault app](app) - the main app where all functionality comes together
+
 ## Features
 - Backup application data to a flash drive.
 - Restore application data from a flash drive.

storage/README.md

@@ -0,0 +1,10 @@
+# Seedvault Storage
+
+This is a library for Seedvault storage backup.
+It can also be used by other apps wanting to provide storage backup feature.
+
+Please see the [design document](doc/design.md) for more information.
+
+There is also a [demo app](demo) that illustrates the working of the library
+and does not need to be a system app with elevated permissions.
+It can be built and installed as a regular app requesting permissions at runtime.

storage/doc/design.md

@@ -1,6 +1,6 @@
 # Overview
 
-This is a design document for Seedvault Storage backup.
+This is a design document for Seedvault storage backup.
 It is heavily inspired by borgbackup, but simplified and adapted to the Android context.
 
 The aim is to efficiently backup media files from Android's `MediaStore`