Create HistogramExample.md

Author: yannrichet

HistogramExample.md

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+```java
+
+import javax.swing.*;
+ 
+import org.math.plot.*;
+ 
+import static org.math.array.StatisticSample.*;
+ 
+public class HistogramExample {
+        public static void main(String[] args) {
+ 
+                // define your data
+                double[] x = randomLogNormal(1000, 0, 0.5); // 1000 random numbers from a log normal statistical law
+ 
+                // create your PlotPanel (you can use it as a JPanel)
+                Plot2DPanel plot = new Plot2DPanel();
+ 
+                // add the histogram (50 slices) of x to the PlotPanel
+                plot.addHistogramPlot("Log Normal population", x, 50);
+ 
+                // put the PlotPanel in a JFrame like a JPanel
+                JFrame frame = new JFrame("a plot panel");
+                frame.setSize(600, 600);
+                frame.setContentPane(plot);
+                frame.setVisible(true);
+ 
+        }
+}
+
+```