feat: Adding smfl hello world code

SFMLEngine/hello.cpp

@@ -0,0 +1,24 @@
+#include <SFML/Graphics.hpp>
+
+int main()
+{
+    sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
+    sf::CircleShape shape(100.f);
+    shape.setFillColor(sf::Color::Green);
+
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        window.clear();
+        window.draw(shape);
+        window.display();
+    }
+
+    return 0;
+}

SFMLEngine/makefile

@@ -0,0 +1,6 @@
+compile:./hello.cpp
+	g++ -c ./hello.cpp
+	g++ hello.o -o app -lsfml-graphics -lsfml-window -lsfml-system
+
+run:
+	./app