feat: debut de la physique, ajout de la gravite

enginecustom/physics.h

@@ -0,0 +1,22 @@
+#ifndef _PHYSICS_H_
+#define _PHYSICS_H_
+
+#include "object.h"
+
+class Physics
+{
+public:
+    public:
+    Physics();
+    Physics(const Physics&);
+    ~Physics();
+
+    float GetGravity();
+    void ApplyGravity(Object*, float);
+
+private:
+    float m_gravity;
+};
+
+#endif
+