Add FreeIPA to "Federated Identity/Authentication" (#664)

* Add FreeIPA to "Federated Identity/Authentication"

* Licences changed to "Multiple"

README.md

@@ -427,6 +427,7 @@ See https://github.com/n1trux/awesome-sysadmin#dns
 
   * [FreeRADIUS](http://freeradius.org/) - High performance and highly configurable multi-protocol policy/authentication server, supporting RADIUS, DHCPv4 and VMPS. ([Source Code](https://github.com/FreeRADIUS/freeradius-server)) `GPLv2` `C`
    * [daloRADIUS](http://www.daloradius.com) - Open-source web management platform for FreeRADIUS-based deployments. ([Source Code](https://github.com/lirantal/daloradius)) `GPLv2`
+  * [FreeIPA](https://www.freeipa.org/) - an integrated Identity and Authentication solution for Linux/UNIX networked environments. A FreeIPA server provides centralized authentication, authorization and account information by storing data about user, groups, hosts. `Multiple` `C` 
   * [IndieAuth](https://indieauth.com) - Sign in with your domain name (using the [rel-me-auth](http://microformats.org/wiki/relmeauth) protocol). `Apache` `Ruby`
   * [Libravatar](https://www.libravatar.org/) - Libravatar is a service which delivers your avatar (profile picture) to other websites. ([Demo](https://www.libravatar.org/account/new/), [Source Code](https://github.com/libravatar/libravatar)) `AGPLv3` `Python`
   * [OpenCA OCSPD](https://pki.openca.org/projects/ocspd/) - An [OCSP](https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol) Responder.