Readme files added to examples.

examples/linear_algebra/README.md

examples/linear_algebra/basic_operations/README.md

examples/linear_algebra/matrix_decompositions/README.md

examples/linear_algebra/pseudo_inverse/README.md

examples/linear_algebra/solve_linear_equations/README.md

examples/linear_algebra/utilities/README.md

examples/localization/README.md

...ples/localization/position_algos/distance_based/README.md

...ples/localization/position_algos/magnetic_based/README.md

...es/localization/position_algos/pos_algos_common/README.md

examples/non_linear_algebra/README.md

examples/non_linear_algebra/optimization/README.md

...s/non_linear_algebra/solve_non_linear_equations/README.md