Created raylib data structures (markdown)

raylib-data-structures.md

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+raylib provides some basic data structures to organize game information. Those structures are quite common in most of the engines out there:
+```c
+    struct Color;           // Color type, RGBA (32bit)
+    struct Rectangle;       // Rectangle type
+    struct Vector2;         // Vector2 type
+    struct Vector3;         // Vector3 type
+    struct Matrix;          // Matrix type (OpenGL style 4x4)
+    
+    struct Image;           // Image type (multiple data formats supported)
+                            // NOTE: Data stored in CPU memory (RAM)               
+    struct Texture2D;       // Texture2D type (multiple internal formats supported)
+                            // NOTE: Data stored in GPU memory (VRAM)
+    struct RenderTexture2D; // RenderTexture2D type, for texture rendering
+    struct SpriteFont;      // SpriteFont type, includes texture and chars data
+    
+    struct Camera;          // Camera type, defines 3d camera position/orientation
+    struct Camera2D;        // Camera2D type, defines a 2d camera
+    struct Mesh;            // Vertex data definning a mesh
+    struct Shader;          // Shader type (generic shader)
+    struct Material;        // Material type
+    struct Light;           // Light type, defines light properties
+    struct Model;           // Basic 3d Model type
+    struct Ray;             // Ray type (useful for raycast)
+    
+    struct Wave;            // Wave type, defines audio wave data
+    struct Sound;           // Basic Sound source and buffer
+    struct Music;           // Music type (file streaming from memory)
+    struct AudioStream;     // Raw audio stream type
+```