Update README.md

README.md

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 # [WIP] GLWE - 2D OpenGL rendering engine optimzed to be compiled to WebAssembly
-GLWE is a 2D *OpenGL* rendering engine written in *C++* that can be compiled for Desktop devices or to WebAssembly with [Emscripten](https://github.com/emscripten-core/emscripten).
+GLWE is a 2D *OpenGL* rendering engine written in *C++* that can be compiled for Desktop devices or to WebAssembly with [Emscripten](https://github.com/emscripten-core/emscripten). 
 The current demo can be downloaded [here](https://github.com/david-palm/glwe/releases/tag/demo).
+<p align="center">
+  <img src="https://user-images.githubusercontent.com/109848051/212894248-67ce8ade-03d4-4278-9833-066976c0e23c.png" width="75%">
+  <br/> 
+      <em>Screenshot of the current demo of GLWE showing two vertex arrays with custom shaders</em>
+    </br>
+</p>
 ## Current features
 - Easy rendering of simple 2D shape through abstraction of shaders, buffers and vertex/index arrays
 - Event system handles key and mouse inputs