[orx-marching-squares] Add demo texts.

orx-marching-squares/src/jvmDemo/kotlin/FindContours02.kt

@@ -5,6 +5,16 @@ import org.openrndr.math.Vector2
 import kotlin.math.PI
 import kotlin.math.cos
 
+/**
+ * This Marching Square demonstration shows the effect of wrapping a distance function
+ * within a cosine (or sine). These mathematical functions return values that periodically
+ * alternate between negative and positive, creating nested contours as the distance increases.
+ *
+ * The `/ 100.0) * 2 * PI` part of the formula is only a scaling factor, more or less
+ * equivalent to 0.06. Increasing or decreasing this value will change how close the generated
+ * parallel curves are to each other.
+ *
+ */
 fun main() = application {
     configure {
         width = 720