Added dependency section to readme.

README.md

@@ -28,6 +28,21 @@ See the
 guide in the GLFW documentation.
 
 
+## Dependencies
+
+GLFW bundles a number of dependencies in the `deps/` directory.
+
+The following dependencies are needed by GLFW:
+
+ - [Khronos extension headers](https://www.opengl.org/registry/)
+
+The following dependencies are needed by the examples and test programs:
+
+ - [Free Getopt](http://freegetopt.sourceforge.net/) for getopt
+ - [TinyCThread](https://gitorious.org/tinythread/tinycthread/) for threading
+ - An OpenGL loader generated by [glad](https://github.com/Dav1dde/glad)
+
+
 ## Changelog
 
 - [Cocoa] Bugfix: Using a 1x1 cursor for hidden mode caused some screen