Support for Ubuntu 16.04 through Docker

[Tlazypanda]

What does the current documentation state?
The current documentation only provides installation through Ubuntu 18.04.

Why do you want to improve the statement?
This will allow for more userbase to develop the project locally.

Proposed statement
Dockerfiles can be created for Ubuntu 16.04 by modifying the contents of the already existing dockerfiles and ensuring all the packages are available for Ubuntu 16.04 installation.

[kaskou]

@Tlazypanda That's good to have 16.04 version but it's not priority. Docker files can be run on any base as you know.

[meenaljain0303]

If the issue is still open, kindly assign me.