Add support for kubernetes ingress controller

[KagChi]

Full advantages support on kubernetes.

Reference:

• https://www.doxsey.net/blog/how-to-build-a-custom-kubernetes-ingress-controller-in-go/
• https://kubernetes.io/docs/concepts/services-networking/ingress-controllers/

[zonblade]

how about using docker image for kubernetes @KagChi ? since it's available for alpha.2
https://hub.docker.com/r/zonblade/mini-gateway/tags

tested with docker

i will update the documentation later.