Updated README.md to list dependencies and goal

README.md

@@ -1,4 +1,6 @@
 # RayTracer
 A whitted ray tracer written in C++
 
-This project mainly serves the purposes of making me more familiar with C++ as well as getting me into computer graphics.
+This project mainly serves the purposes of making me more familiar with C++ as well as getting me into computer graphics. I hope though, that it is helpful and/or educational for others too and I try to keep the code understandable, rather than highly performant.
+
+It is written in C++11 and thus requires a compiler capable of that standard. It uses CImg for image import and export, which at least depends on X11 and pthread libraries. CImg dependencies are handled in its own `.cmake` file. It further depends on [PugiXML](https://github.com/zeux/pugixml) for XML parsing and uses [TinyOBJLoader](https://github.com/syoyo/tinyobjloader) as in-tree library.