Update README.md

Author: soulfly

samples/video_conferencing/README.md

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+# Overview 
+QuickBlox provides the Multiparty Video Conferencing solution which allows to setup video conference between 10-12 people. It's built on top of WebRTC SFU technologies.
+
+Multi-conference server is available only for Enterprise plans, with **additional fee**. Please refer to [https://quickblox.com/developers/EnterpriseFeatures] for more information and contacts.
+
+# Features supported
+
+* Video/Audio Conference with 10-12 people
+* Join-Rejoin video room functionality (like Skype)
+* Mute/Unmute audio/video stream (own and opponents)
+* Display bitrate
+* Switch video input device (camera)
+
+# Documentation
+Check 'docs' dir.