initial commit

third_party/eigen/doc/examples/QuickStart_example.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+using Eigen::MatrixXd;
+
+int main() {
+  MatrixXd m(2, 2);
+  m(0, 0) = 3;
+  m(1, 0) = 2.5;
+  m(0, 1) = -1;
+  m(1, 1) = m(1, 0) + m(0, 1);
+  std::cout << m << std::endl;
+}