update: add information for misp-restore.sh script

tools/misp-backup/README.md

@@ -1,3 +1,6 @@
+MISP-BACKUP
+-----------
+
 shell script for making a MISP backup
 
 Installation
@@ -33,4 +36,35 @@ Licence
 =======
 
 See LICENSE
-initial idea based daverstephens on https://github.com/daverstephens/The-SOC-Shop
+initial idea based daverstephens on https://github.com/daverstephens/The-SOC-Shop
+
+
+MISP-RESTORE
+------------
+
+This script aims at restoring a backup made with `misp-backup.sh` script found in this folder.
+
+Pre-requisites
+==============
+- Apache, MISP and mariaDB/MySQL should be installed before running this script.
+- The versions of MISP software backed up and restored should be the same.  (e.g. restore fiels database of a MISP v2.4.86 on a server with the same version of MISP)
+- This script only restores the data on a database installed on localhost.
+
+Description
+===========
+ This script restores following file/DB from an archive created with `misp-backup.sh`:
+ - app/Config PHP files
+ - app/webroot/img orgs and custom files
+ - app/webroot/files 
+ - GnuPG files
+ - MYSQL User used in archive or its password if exists
+ - MISP database
+ 
+
+
+Run the script
+==============
+
+```
+run ./misp-restore.sh  PATH_TO_ARCHIVE.tar.gz
+```