Update Readme.md

Author: crystalct

samples/graphics/rsx_Basic_Cube/Readme.md

@@ -1,4 +1,3 @@
-A basic example to use RSX and Vertex/Fragment without camera position, eyes position, lights, 3D objects, textures, etc etc.
-Just draw a tringle.....
+A basic cube example to use atexture on a cube and to rotate it.
 
-![RSX basic example](https://github.com/crystalct/PSL1GHT/blob/develop/samples/graphics/rsx_Basic/rsx_basic.png?raw=true)
+![RSX basic cube example](rsx_basic_cube.png?raw=true)