Added readme for Dependencies folder

Dependencies/Readme.txt

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+This folder contains precompiled versions of various optional
+dependencies for OpenTK. These are meant for your convenience
+and are completely optional to use.
+
+The folder structure is split by CPU architecture:
+Dependencies/x86/ - compiled for 32bit Intel and AMD processors
+Dependencies/x64/ - compiled for 64bit Intel and AMD processors
+Dependencies/     - contains readme and license files
+
+The dependencies are as follows:
+
+
+[SDL2.dll]
+[libSDL2.dylib]
+
+The Simple DirectMedia Library compiled for Windows and Mac OS X.
+Copy these to your application directory in order to use the SDL2
+platform backend for OpenTK.
+
+http://libsdl.org
+
+"Simple DirectMedia Layer is a cross-platform development library
+designed to provide low level access to audio, keyboard, mouse,
+joystick, and graphics hardware via OpenGL and Direct3D."
+
+Advantages:
++ improved stability
++ improved joystick support
++ support for Macbook Retina displays
++ support for Steam "Big Picture" controller configuration
+
+Disadvantages:
+- does not support OpenTK.GLControl (fix in progress)
+- does not support multiple mice or keyboards
+- does not support DisplayResolution.ChangeResolution
+
+It is highly recommended that you use the SDL2 backend on Mac OS X.
+
+
+[openal32.dll]
+
+OpenAL Soft compiled for Windows. Copy this to your application
+directory in order to use OpenAL on Windows.
+
+http://kcat.strangesoft.net/openal.html
+
+"OpenAL Soft is an LGPL-licensed, cross-platform, software
+implementation of the OpenAL 3D audio API."
+
+This is required in order to use OpenAL on Windows platforms.
+Linux and Mac OS X support OpenAL out of the box.
+
+
+[libEGL.dll]
+[libGLESv2.dll]
+[d3dcompiler_46.dll]
+
+ANGLE Project compiled for Windows. Copy these to your application
+directory in order to use OpenGL ES 2.0 on Windows.
+
+https://code.google.com/p/angleproject/
+
+"The goal of ANGLE is to allow Windows users to seamlessly run WebGL
+and other OpenGL ES 2.0 content by translating OpenGL ES 2.0 API
+calls to DirectX 9 or DirectX 11 API calls."
+
+These are required if you wish to publish an OpenGL ES application
+to the Windows Store. You can also use these in order to port or test
+OpenGL ES code from and to mobile devices (Android, iPhone).