add mono c# (using dotnet9.0 from https://github.com/dotnet/runtime), add ECS (entt), add some c# code, add fastNoise

ExampleApp/Src/Script.cs

@@ -0,0 +1,38 @@
+using System;
+
+using Prism;
+
+namespace Example
+{
+    public class Script : Entity
+    {
+        public float Speed = 5.0f;
+
+        public void OnCreate()
+        {
+            Console.WriteLine("Script.OnCreate");
+            Console.WriteLine("this is c# function OnCreate, this will be called by cpp");
+        }
+
+        public void OnUpdate(float ts)
+        {
+            Mat4 transform = GetTransform();
+            Vec3 translation = transform.Translation;
+
+            float speed = Speed * ts;
+
+            if (Input.IsKeyPressed(KeyCode.Up))
+                translation.Y += speed;
+            else if (Input.IsKeyPressed(KeyCode.Down))
+                translation.Y -= speed;
+            if (Input.IsKeyPressed(KeyCode.Right))
+                translation.X += speed;
+            else if (Input.IsKeyPressed(KeyCode.Left))
+                translation.X -= speed;
+
+            transform.Translation = translation;
+            SetTransform(transform);
+        }
+
+    }
+}