[orx-turtle] Add orx-turtle module

orx-turtle/src/jvmDemo/kotlin/DemoTurtle01.kt

@@ -0,0 +1,40 @@
+/*
+Drawing a square using the turtle interface.
+*/
+
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.turtle.turtle
+
+fun main() {
+    application {
+        program {
+            // turtle returns List<ShapeContour>
+            val contours = turtle(drawer.bounds.center) {
+                penUp()
+                forward(50.0)
+                rotate(90.0)
+                forward(50.0)
+                penDown()
+
+                rotate(90.0)
+                forward(100.0)
+
+                rotate(90.0)
+                forward(100.0)
+
+                rotate(90.0)
+                forward(100.0)
+
+                rotate(90.0)
+                forward(100.0)
+            }
+
+            extend {
+                // draw the contours
+                drawer.stroke = ColorRGBa.PINK
+                drawer.contours(contours)
+            }
+        }
+    }
+}