Fix docker file in examples/httpserver in GoFr

[coolwednesday]

Currently the docker file is not able to set-up the services correctly. It exits and gives an error. This can be fixed. Also add Readme to refer to run the docker file and set-up things.

[ckshitij]

Hi @coolwednesday,

I would be able to take up this task. Could you please assign this to me?

[aryanmehrotra]

sure, assigning to you