Add project files.

Raster3D.App/Interfaces/IDrawable.cs

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+using Microsoft.Xna.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Raster3D.App.Interfaces
+{
+    internal interface IDrawable
+    {
+        void draw(GameTime time);
+    }
+}

Raster3D.App/Interfaces/IEntity.cs

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+using Raster3D.Engine;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Raster3D.Engine.Graphics;
+
+namespace Raster3D.App.Interfaces
+{
+    internal interface IEntity
+    {
+        int id { get; set; }
+        Vec2D position { get; set; }
+
+        void tick();
+        void spawn();
+        void free();
+    }
+}