added readme

Readme.md

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+# Responsibilize your users !
+
+## Goal
+
+You still need to check wether your backups are working
+
+You still need (must) to perform regular test files restaurations.
+
+But you can also empower your user, and warn them if their backups are tool old
+
+
+## prerequisites
+
+You need a working local mail forwarder. ie you should be able to successfully use the "mail" command.
+
+It won't do if your wargings goes to the spam folder.
+
+## Installation
+
+Just download the script, make it executable, and create a cronjob / systemd timer to run it daily
+
+## Configuration
+
+For each client you want to check with this script, insert into client conf file the following 2 parameters:
+
+  * warn=X # X is the max age (in days) of latest backup
+  * email=Y # is the email of the person to warn
+
+## Customization
+
+The email will be sent as the account used for the cronjob (it does not need to be root)
+
+The message sent can be customized at ligne 23