initial commit

third_party/eigen/doc/snippets/MatrixBase_reverse.cpp

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+MatrixXi m = MatrixXi::Random(3, 4);
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here is the reverse of m:" << endl << m.reverse() << endl;
+cout << "Here is the coefficient (1,0) in the reverse of m:" << endl << m.reverse()(1, 0) << endl;
+cout << "Let us overwrite this coefficient with the value 4." << endl;
+m.reverse()(1, 0) = 4;
+cout << "Now the matrix m is:" << endl << m << endl;