Added clap options to choose the renderer size

src/engine/renderer/mod.rs

@@ -50,12 +50,12 @@ pub struct Renderer {
 
 impl Renderer {
     /// Creates a new renderer.
-    pub fn new(width: u32, height: u32) -> Renderer {
+    pub fn new(width: u32, height: u32, fullscreen: bool) -> Renderer {
 
         let mut window = RenderWindow::new(
             (width, height),
             "Free Rusty Maker",
-            Style::CLOSE,
+            if fullscreen { Style::FULLSCREEN } else { Style::CLOSE },
             &Default::default(),
         );
         window.set_vertical_sync_enabled(true);