add topics

[Beliavsky]

I suggest adding topics such as linear-algebra, sparse, sparse-matrix, linear-equations in the About section at https://github.com/wrtobin/las.

[jacobmerson]

@Beliavsky thanks for your interest and the suggestion. Are you currently using or considering using las? Currently I am only maintaining this to the extent that it is used in a Multiscale analysis code mumfim and I will be eventually transitioning away from this library.

If you think there is broader interest for this type of library that we are missing we could consider reinvigorating it. I think many of the ideas in this library can be further refined with new compile time programming features that have recently been added to C++.