luci-app-attendedsysupgrade: add README

The app should be explained.

Signed-off-by: Paul Spooren <mail@aparcar.org>

diff --git a/applications/luci-app-attendedsysupgrade/README.md b/applications/luci-app-attendedsysupgrade/README.md
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+# luci-app-attendedsysupgrade
+
+This app allows firmware upgrades of routers while keeping user installed packages.
+To do so the app sends a request to an *Atttended SysUpgrade server* which will
+respond with a custom image, containing all previously installed packages.
+
+The process takes per images between 30 seconds and 5 minutes, please be
+patient.
+
+More information on the backend server and how to host one are available on the
+projects page: https://github.com/aparcar/asu/