规范模块目录和第三方依赖结构

third_party/eigen3/doc/snippets/MatrixBase_adjoint.cpp

@@ -0,0 +1,3 @@
+Matrix2cf m = Matrix2cf::Random();
+cout << "Here is the 2x2 complex matrix m:" << endl << m << endl;
+cout << "Here is the adjoint of m:" << endl << m.adjoint() << endl;