Add the base cli

[NyanKiyoshi]

This PR adds a CLI interface to the package. It adds a show command that takes a file.

• By default it prints to stdout the file content formatted as a table;
• By passing --html it will output a generated html code to stdout.

Todo:

• Implement raw visualization;
• Implement HTML visualization;
  • Add test for rendering;
  • Add test for rendering no data;
  • Add test for rendering with a custom template both:
    • Valid
    • Invalid
• Add test for missing required key;
• Update README:
  • Add --help
  • Add the show command
  • Add the html command
    • Add how to customize it.

[codecov-io]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #3   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      4    +3     
  Lines          47    130   +83     
  Branches        0     13   +13     
=====================================
+ Hits           47    130   +83

Impacted Files	Coverage Δ
pytest_django_queries/tables.py	100% <100%> (ø)
pytest_django_queries/utils.py	100% <100%> (ø)
pytest_django_queries/cli.py	100% <100%> (ø)

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