Add project files.

Car simulation/IPhysicsObject.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Numerics;
+using System.Text;
+
+namespace Car_simulation
+{
+    public interface IPhysicsObject
+    {
+        Vector2 Position { get; }
+        float GetResistanceForce(Vector2 carPosition, float carSpeed);
+        float GetTractionCoefficient(Vector2 carPosition);
+    }
+}