Add 3 new type of object: Sphere, Object and Intersect.

Add Intersect object as a way to report where a ray intersect another object and which one it is.
Add an Object base class for all object that can be rendered.
Add the Sphere object.

source/include/intersection.h

@@ -0,0 +1,43 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Intersection header
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#ifndef DORAYME_INTERSECTION_H
+#define DORAYME_INTERSECTION_H
+
+#include <stdlib.h>
+
+class Object;
+
+struct Intersection
+{
+    double t;
+    Object *object;
+};
+
+static Intersection *newIntersection(double t, Object *object)
+{
+    Intersection *ret = (Intersection *)calloc(sizeof(Intersection), 1);
+
+    if (ret != nullptr)
+    {
+        ret->t = t;
+        ret->object = object;
+    }
+
+    return ret;
+}
+
+static void freeIntersection(Intersection *i)
+{
+    if ( i != nullptr )
+    {
+        free(i);
+    }
+}
+
+#endif //DORAYME_INTERSECTION_H