add main routine for problem 10

java/Problem010.java

@@ -5,6 +5,10 @@ import java.util.ArrayList;
 /** Sum of Primes Below 2 Million.
  */
 public class Problem010 implements EulerSolution { 
+	public static void main(String[] args) { 
+		Problem010 p = new Problem010();
+		System.out.println(p.run());
+	}
 
 	public String run() {
 		int TWO_MILLION = 2000000;