add; Dockerfile for running inside a container

[karthikmuralidharan]

For some weird reason I wasn't able to successfully install all the dependencies on my macOS 10.12.5 (16F73) with Node versions v8.1.2, v8.0.0, v7.10.0.

I kept constantly receiving this error:

29396 verbose stack Error: sip.js@0.7.5 postinstall: `cd src/Grammar && mkdir -p dist && pegjs --extra-options-file peg.json src/Grammar.pegjs dist/Grammar

I didn't try to dig any deeper into this and simply created a Dockerfile and ran a container to see if it had to do something with my current OS environment. It worked!! So I thought it might be useful for somebody else.

[markandrus]

Interesting—thanks for the contribution, @karthikmuralidharan. How would you imagine the README.md changing to describe this?

Also, FWIW, the pegjs issue should be solved as of twilio-video.js@1.2.2.

[karthikmuralidharan]

@markandrus I forgot to reply :). I have updated the README to provide instructions on building the image and running the container and have made some small tweaks to the Dockerfile as well.

[scarroll32]

bump Twilio