Added Tutorial 27 to the tutorial list

Author: TheMostDiligent

README.md

@@ -56,6 +56,7 @@ To build and run the applications in the module, please follow the [instructions
   - [24 - Variable Rate Shading](https://github.com/DiligentGraphics/DiligentSamples#tutorial-24---variable-rate-shading)
   - [25 - Render State Packager](https://github.com/DiligentGraphics/DiligentSamples#tutorial-25---render-state-packager)
   - [26 - Render State Cache](https://github.com/DiligentGraphics/DiligentSamples#tutorial-26---render-state-cache)
+  - [27 - Post-Processing](https://github.com/DiligentGraphics/DiligentSamples#tutorial-27---post-processing)
 - [Samples](https://github.com/DiligentGraphics/DiligentSamples#samples)
   - [Atmospheric Light Scattering](https://github.com/DiligentGraphics/DiligentSamples#atmospheric-light-scattering-sample)
   - [GLFW Demo](https://github.com/DiligentGraphics/DiligentSamples#glfw-demo)
@@ -281,6 +282,13 @@ application starts.
 ![](Tutorials/Tutorial26_StateCache/Screenshot.jpg)
 
 
+## [Tutorial 27 - Post-Processing](https://github.com/DiligentGraphics/DiligentSamples/tree/master/Tutorials/Tutorial27_PostProcessing)
+
+This tutorial demonstrates how to use post-processing effects from the DiligentFX module.
+
+![](Tutorials/Tutorial27_PostProcessing/Screenshot.jpg)
+
+
 # Samples
 
 ## [Atmospheric Light Scattering sample](Samples/Atmosphere)