Makefile: improve 'make style' reporting

[caputomarcos]

• Add a help target to a Makefile that will allow all targets to be self documenting.
• Docker Build/Push/Run
• PEP 440 -- Version Identification and Dependency Specification/Version scheme.
• PEP 405 -- Python Virtual Environments.

[leopepe]

Done

[leopepe]

Wrongly closed.

[leopepe]

Done so far in v0.2.1:

• Docker build: target docker-build created (push not necessary right now since the library distribution will be done by pip)
• PEP 440: Version 0.2.1 uses poetry to do the version release control. (is that enough to mark this one as done?) [?]
• PEP 405: Full management of virtualenv performed by poetry and working fine

The help target is yet to be done but I am not sure how to accomplish. I do require more input on this.