Reductions/Broadcasting/Visitor Tutorial added

doc/examples/Tutorial_ReductionsVisitorsBroadcasting_broadcast_simple_rowwise.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+#include <Eigen/Dense>
+
+using namespace std;
+int main()
+{
+  Eigen::MatrixXf mat(2,4);
+  Eigen::VectorXf v(4);
+  
+  mat << 1, 2, 6, 9,
+         3, 1, 7, 2;
+         
+  v << 0,1,2,3;
+       
+  //add v to each row of m
+  mat.rowwise() += v;
+  
+  std::cout << "Broadcasting result: " << std::endl;
+  std::cout << mat << std::endl;
+}