[orx-text-writer] Add writer demo

orx-text-writer/src/jvmDemo/kotlin/DemoTextWriter01.kt

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+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.isolated
+import org.openrndr.draw.loadFont
+import org.openrndr.extra.textwriter.writer
+import org.openrndr.shape.Rectangle
+
+/**
+ * This demo features the drawing of a centered rectangle and the addition of styled text inside
+ * the rectangle. The application manages the drawing of shapes and implementation of text rendering
+ * with specific font and settings.
+ *
+ * The following operations are performed:
+ * - A rectangle is created from the center of the drawing bounds.
+ * - The rectangle is drawn without a fill and with a white stroke.
+ * - A custom font is loaded and applied to the drawer.
+ * - A `TextWriter` is utilized to display the text "hello world" inside the rectangle, adhering to
+ *   specific styling and formatting rules.
+ *
+ * Key Components:
+ * - `application` establishes the visual environment.
+ * - `Rectangle` provides a way to define the rectangular area.
+ * - `drawer` enables isolated operations for drawing elements.
+ * - `writer` facilitates text rendering with alignment and spacing adjustments.
+ */
+fun main() = application {
+    program {
+        extend {
+            val r = Rectangle.fromCenter(drawer.bounds.center, 200.0, 200.0)
+            drawer.isolated {
+                drawer.fill = null
+                drawer.stroke = ColorRGBa.WHITE
+                drawer.rectangle(r)
+            }
+            drawer.fontMap = loadFont("demo-data/fonts/IBMPlexMono-Regular.ttf", 24.0)
+            writer {
+                box = r.offsetEdges(-10.0)
+                newLine()
+                text("hello world")
+            }
+        }
+    }
+}