docs: add example usage for VectorJS in README

Author: burdockcascade

README.MD

@@ -0,0 +1,37 @@
+# VectorJS
+
+## Example
+```js
+import {Application, Rectangle, Vector2, Palette } from "vectorjs";
+
+const screenWidth = 800;
+const screenHeight = 600;
+const fpsPos = new Vector2(10, 10);
+const rect = new Rectangle(30, 30, 200, 45);
+const point1 = new Vector2(400, 150);
+const point2 = new Vector2(300, 350);
+const point3 = new Vector2(500, 350);
+
+const app = new Application(screenHeight, screenWidth, "Window");
+app.run({
+
+    onDraw(render) {
+        render.withLayer2D((ctx) => {
+            ctx.drawFPS(fpsPos);
+
+            ctx.shapes.drawRectangle(rect, {
+                color: Palette.RED
+            })
+
+            ctx.shapes.drawCircle(point1, 60, {
+                color: Palette.GREEN
+            })
+
+            ctx.shapes.drawTriangle(point1, point2, point3, {
+                color: Palette.BLUE
+            })
+
+        });
+    }
+});
+```