OCS inventory NG: add source code link, license, language

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

README.md

@@ -152,7 +152,7 @@ Managing software on desktop computers.
 _See also: [IT Asset Management](#it-asset-management)_
 
 - [Chocolatey](https://chocolatey.org/) – Windows CLI package manager written in .NET/PS, based on NuGet.
-- [OCS Inventory NG](https://ocsinventory-ng.org/?lang=en) - Inventory, deployment and network scan.
+- [OCS Inventory NG](https://ocsinventory-ng.org/?lang=en) - Inventory, deployment and network scan. ([Source Code](https://github.com/OCSInventory-NG/OCSInventory-Server)) `GPL-2.0` `Perl/PHP`
 - [WAPT](https://dev.tranquil.it/wiki/WAPT_-_apt-get_pour_Windows/en) - Network-wide (un)installation, configuration and upgrades of Windows based software.
 - [WPKG](http://wpkg.org/) - Software deployment, upgrade and removal program for Windows.