Add Markojs implementation

[maxmilton]

Recently I've been using a lesser known JS lib, Markojs, and I've had great success with it from a performance perspective. Would be very interesting to see where it slots in against all the other implementations.

Homepage: https://markojs.com
Github: https://github.com/marko-js/marko

I've also created an issue in the Markojs repo about the same thing: marko-js/marko#993