Add screenshot and link to APK Readme

README.md

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 # GLARE - GL Android Rendering Engine
-GLARE is a 3D rendering engine for Android devices supporting on OpenGL ES 3 written in Java. It is completely written from scratch and does not use any external libraries. It is currently displaying a cube with a tile texture which can be easily swapped out in code.
+GLARE is a 3D rendering engine for Android devices supporting on OpenGL ES 3 written in Java. It is completely written from scratch and does not use any external libraries. It is currently displaying a cube with a tile texture which can be easily swapped out in code. The current APK of the demo can be downloaded [here](https://github.com/david-palm/GLARE/releases/download/stable/glare_stable_v0.1.apk)!
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+  <img src="https://user-images.githubusercontent.com/109848051/212898975-279f065b-6efa-46c4-825b-6b0994447420.png" height="500px">
+</p>
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 ## Rendering
 GLARE allows the user to render 3D meshes as well as 2D UI elements:
 - 3D objects have materials consisting of an albedo map or a color, a normal map and a roughness map