Update OpenGL standalone example

+ Remove unused directories
+ Update cpp/README.txt to include new directories

cpp/README.md

@@ -2,12 +2,14 @@
 
 ```
 shaunrd0/klips/cpp/
+├── algorithms  # Examples of various algorithms written in C++
 ├── cmake       # Example of using cmake to build and organize larger projects
 ├── datastructs # Collection of useful datastructures written in C++
-├── opengl      # Barebones opengl application written in C++ built with make
+├── opengl      # Barebones opengl application written in C++ built with gcc
+├── patterns    # Examples of various design patterns written in C++
 ├── README.md
-├── sdl         # Barebones sdl application written in C++ built with make
-└── sdl-cmake   # Barebones sdl application written in C++ built with cmake
+├── sdl-cmake   # Barebones sdl application written in C++ built with cmake
+└── sdl         # Barebones sdl application written in C++ built with gcc
 ```
 
 This directory contains a `CMakeLists.txt`, which can be selected to open as a