message: Updated readme: added os logos
diff: @@ -7,11 +7,11 @@ so it must always be handled first.
  | Platform | Build Status |
  | ---------------------| ------------- |
  -| Win32 | [![Build Status](https://ci.appveyor.com/api/projects/status/github/DiligentGraphics/DiligentCore?svg=true)](https://ci.appveyor.com/project/DiligentGraphics/diligentcore) |
  -| Universal Windows | [![Build Status](https://ci.appveyor.com/api/projects/status/github/DiligentGraphics/DiligentCore?svg=true)](https://ci.appveyor.com/project/DiligentGraphics/diligentcore) |
  -| Linux | [![Build Status](https://travis-ci.org/DiligentGraphics/DiligentCore.svg?branch=master)](https://travis-ci.org/DiligentGraphics/DiligentCore) |
  -| MacOS | [![Build Status](https://travis-ci.org/DiligentGraphics/DiligentCore.svg?branch=master)](https://travis-ci.org/DiligentGraphics/DiligentCore) |
  -| iOS | [![Build Status](https://travis-ci.org/DiligentGraphics/DiligentCore.svg?branch=master)](https://travis-ci.org/DiligentGraphics/DiligentCore) |
  +| <img src="media/windows-logo.png" width=24 valign="middle"> Win32 | [![Build Status](https://ci.appveyor.com/api/projects/status/github/DiligentGraphics/DiligentCore?svg=true)](https://ci.appveyor.com/project/DiligentGraphics/diligentcore) |
  +|<img src="media/uwindows-logo.png" width=24 valign="middle"> Universal Windows | [![Build Status](https://ci.appveyor.com/api/projects/status/github/DiligentGraphics/DiligentCore?svg=true)](https://ci.appveyor.com/project/DiligentGraphics/diligentcore) |
  +| <img src="media/linux-logo.png" width=24 valign="middle"> Linux | [![Build Status](https://travis-ci.org/DiligentGraphics/DiligentCore.svg?branch=master)](https://travis-ci.org/DiligentGraphics/DiligentCore) |
  +| <img src="media/macos-logo.png" width=24 valign="middle"> MacOS | [![Build Status](https://travis-ci.org/DiligentGraphics/DiligentCore.svg?branch=master)](https://travis-ci.org/DiligentGraphics/DiligentCore) |
  +|<img src="media/apple-logo.png" width=24 valign="middle"> iOS | [![Build Status](https://travis-ci.org/DiligentGraphics/DiligentCore.svg?branch=master)](https://travis-ci.org/DiligentGraphics/DiligentCore) |
  [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
  [![Chat on gitter](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/diligent-engine)
  