Update README.md

Author: turbo

README.md

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-# NanoCL
-Zero-Overhead bare-metal GPGPU library for C++ on Windows.
+[![](http://i.imgur.com/pE9Bswx.png)]()
+
+NanoCL provides a thin wrapper on top of OpenGl functions for GPGPU programming. It can be used to allocate and manage GPU memory and run GLSL kernels on standard `float[]` arrays.
+
+This library is the upstream source for [turbo.js](https://github.com/turbo/js), but is vastly more capable. 
+
+Though NanoCL is much more trivial than OpenCL, it can provide certain advantages:
+
+- virtually no compile-time overhead
+- completely dependency-free
+- compatible with almost all GPUs and GLSL-compatible software renderers
+- transparent source code
+- allows for easier tracing using performance analysis (perf, Amp, ...) because no superfluous levels of indirections are used
+
+NanoCL was designed for Windows. It does not require any OpenGL wrapper libraries like GLU or GLFW, just the OpenGL headers. It was tested using TDM-GCC, ICC and MSVC.
+
+Documentation is in progress.