Added Pipe class and spawn logic

src/Pipe.java

+import bagel.*;
+
+public class Pipe {
+    private final double velocity = -5;
+    private double pos = Window.getWidth(); /* x-coord at spawn */
+    private final int pixelGap = 168;
+
+    /* the higher this value the higher the pipe gap spawns, vice versa */
+    private final int initialY = 50; /* y-value of pipe at spawn */
+
+    private Image pipeImage = new Image("res/pipe.png");
+
+    public void Pipe() {
+
+    }
+
+    public void Render() {
+        /* upside down pipe */
+        this.pipeImage.draw(this.pos, -this.initialY);
+
+        /* straight up pipe */
+        DrawOptions options = new DrawOptions();
+        this.pipeImage.draw(this.pos, Window.getHeight() -this.initialY +this.pixelGap,
+                options.setRotation(Math.PI));
+
+        this.pos += this.velocity;
+    }
+}
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