added usage paragraph to README.md

README.md

@@ -10,6 +10,8 @@
 
 ```
 
+# General
+
 RAD (recursive after date) is a bash script for keeping two big folders in sync fast.
 This is archieved by only copying the last changes after a certain date.
 Originally it was created to keep a Nextcloud Twin in sync to a 
@@ -22,3 +24,38 @@ This can be achieved by the command:
 ```
 sudo -u www-data /var/www/nextcloud/occ decks:export <user-id> > /var/www/nextcloud/data/<user-id>/files
 ```
+
+
+
+# Usage
+
+Go to the folder containing the folder that you want to backup.
+
+For example, to backup /var/www/nextcloud/data, do
+
+```
+cd /var/www/nextcloud
+```
+
+Then create the backupfolder and go into it
+```
+mkdir data-backup
+cd data-backup
+```
+
+Now you should be in 
+```
+/var/www/nextcloud/data-backup
+```
+whereas the data folder should be in the same dir as data-backup
+```
+/var/www/nextcloud/data
+```
+
+Now change the variables accordingly in the extract and inject script.
+
+The extract script will create a copy of data and its subdirs, if they
+contain data after the date specified.
+
+After that, the inject script will copy to folder specified in the script.
+