Add Engine

Engine.md

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+# Engine
+
+The engine initializes SDL2, TFF and handles basic functions
+
+## Constructor
+
+This initializes SDL2 and creates a window.
+` engine = new Engine("Game", 800, 600);`
+
+## startFrame
+
+This sets the `frameStart` variable to the output of `SDL_GetTicks()` to be able to adjust framerate.
+
+## render
+
+This updates the screen with any changes by running `SDL_RenderPresent(renderer);`. It also automatically delays to reach the desired framerate if necessary.
+
+## clear
+
+This clears the screen with a provided color `engine->clear({ 100, 150, 255, 255 });`, this color is a `SDL_Colour` type.
+
+## Update
+
+This runs all the input updates using the Input class.
+
+## Deconstructor
+
+This destroys the `renderer` and `window`, It also runs `SDL_Quit()` and `TFF_Quit()`.