feat: additional instructions for running on different platforms

README.md

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+
+
+# Project Description
+
+This is a basic future game engine for OpenGL 3D rendered games
+
+## Multi-GPU Devices
+
+If you want to use non-primary GPU on your device when launching the game specifically on Linux you should specify additional environment variables before running. For example in my case I have a hybrid gaming laptop with 2 GPUs AMD from CPU and NVIDIA discrete.
+
+The run command in that case would look following:
+
+```console
+__NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia ./build/CodingGame
+```