docs(README.md): added example Dockerfile and instructions to run inside docker

[beaverden]

I submitted the first draft of running the library though docker, although I'm not sure if it's the right way. Technically, the library is not dockerized and it's just a container that installs the library through npm.

Probably a better solution would be to dockerize the library itself and provide the image on docker hub, such that different commands can be ran. With that being said, I can't say that I'm experienced in dockerizing npm packages

[beaverden]

It seems like there already are docker images for jsonresume (like https://hub.docker.com/r/svendowideit/jsonresume/ - https://github.com/SvenDowideit/dockerfiles/blob/master/jsonresume/Dockerfile)

Which do a much better job at being able to run generic commands

[thomasdavis]

@beaverden Thanks for that, are you saying the pre-existing docker setups solve your initial problem?

[beaverden]

I realized that the purpose of the fix was to specify how to run the library when chromium doesn't install properly using puppeteer and npm, not to add a (somehow) working dockerfile (of which there already are plenty). See #599 for a lighter fix that just adds some info to the README