Created Scene System (markdown)

Scene-System.md

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+The scene system is the backbone of the game client, utilizing the [strategy pattern](http://en.wikipedia.org/wiki/Strategy_pattern) to control various different logical scenarios found throughout the game (the main menu, the game world, combat scenarios, etc). It consists of the following files:
+
+* scene_list.hpp
+* base_scene.hpp
+* base_scene.cpp
+* scene_manager.hpp
+* scene_manager.cpp
+* main.cpp
+
+## Breakdown
+
+main.cpp simply creates an instance of SceneManager, calls it's Init(), Loop() and Quit() functions in order, and handles any fatal exceptions thrown from the rest of the program.  
+scene_list.hpp holds an enum class of macros, one for each scene in the game. All scenes in the game should include this file in the .cpp.  
+base_scene.hpp and base_scene.cpp hold the interface of the strategy pattern i.e. all scenes in the game MUST inherit from the BaseScene class. This class handles the game's screen (which is a static member) and the player's input (via SDL).  
+...