updated readme

Author: tuxalin

Readme.md

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 # Lock-free CommandBuffer
 [![Language](https://img.shields.io/badge/language-C++-blue.svg)](https://isocpp.org/)
 [![License](http://img.shields.io/badge/license-MIT-blue.svg)](http://opensource.org/licenses/MIT)
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 A lock-free CommandBuffer implementation designed for multi-threaded rendering applications. 
 Useful to reduce state switches(i.e. materials, shaders), depth sorting(for transparency or hardware early-z rejection) and also for dispatching commands from multiple threads.
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 ## Features
 - designed for high-congestion as it's lock-free
 - graphics API independent(see cb::RenderContext)