New Projectiles class

Refactor of Bullet class
Different method of shooting.

sources/Rocket.cpp

@@ -0,0 +1,9 @@
+#include "../headers/Rocket.h"
+
+void Rocket::update() {
+    sprite.move(0.0f, speed);
+    position.y += int(speed);
+    if(position.y < -100) {
+        outOfBounds = true;
+    }
+}