backups: add licenses/language/platform tags

- ref. https://github.com/awesome-foss/awesome-sysadmin/issues/416

README.md

@@ -97,11 +97,11 @@
 
 *Backup software.* Also see [Restic's list of Linux backup software](https://github.com/restic/others).
 
-- [Amanda](https://www.amanda.org/) - Client-server model backup tool. ([Source Code](https://github.com/zmanda/amanda))
-- [Backupninja](https://0xacab.org/liberate/backupninja) - Lightweight, extensible meta-backup system.
-- [BackupPC](https://backuppc.github.io/backuppc/) - BackupPC is a high-performance system for backing up to disk. ([Source Code](https://github.com/backuppc/backuppc))
-- [Bareos](https://www.bareos.org/) - A fork of Bacula backup tool. ([Source Code](https://github.com/bareos/bareos))
-- [Barman](https://pgbarman.org) - Backup and Recovery Manager for disaster recovery of PostgreSQL servers. ([Source Code](https://github.com/EnterpriseDB/barman))
+- [Amanda](https://www.amanda.org/) - Client-server model backup tool. ([Source Code](https://github.com/zmanda/amanda)) `MIT` `C`
+- [Backupninja](https://0xacab.org/liberate/backupninja) - Lightweight, extensible meta-backup system. `GPL-2.0` `Shell`
+- [BackupPC](https://backuppc.github.io/backuppc/) - BackupPC is a high-performance system for backing up to disk. ([Source Code](https://github.com/backuppc/backuppc)) `GPL-3.0` `Perl`
+- [Bareos](https://www.bareos.org/) - A fork of Bacula backup tool. ([Source Code](https://github.com/bareos/bareos)) `AGPL-3.0` `C++/C`
+- [Barman](https://pgbarman.org) - Backup and Recovery Manager for disaster recovery of PostgreSQL servers. ([Source Code](https://github.com/EnterpriseDB/barman)) `GPL-3.0` `Python`
 - [BorgBackup](https://github.com/borgbackup/borg) - A fork of [Attic](https://attic-backup.org) deduplicating backup program written in Python.
 - [Burp](https://burp.grke.org/) - Network backup and restore program. ([Source Code](https://github.com/grke/burp))
 - [Dar](http://dar.linux.free.fr/) - Which stands for Disk ARchive, is a robust and rich featured archiving and backup software of the tar style. ([Source Code](https://github.com/Edrusb/DAR)) `GPL-2.0` `C++`