add Readme

README.md

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+# renderer
+
+This softwre aims to be an OpenGL renderer written in Haskell following the
+OpenGL tutorial by The Cherno
+(<https://www.youtube.com/playlist?list=PLlrATfBNZ98foTJPJ_Ev03o2oq3-GGOS2>).
+
+There are some major deviations from the tutorial setup here as follows:
+
+* Code base is entirely written in Haskell, not C++
+* instead of GLFW with GLEW I use SDL2 out of familiarity
+
+I leave as many helpful comments as possible throughout the code, so feel free
+to peruse it.