Add rule feature

[jsa34]

• Add changelog entry
• Add README entry
• Add tests
  Resolves Rule keyword #511

[codecov]

Codecov Report

Attention: Patch coverage is 91.07143% with 10 lines in your changes missing coverage. Please review.

Project coverage is 95.38%. Comparing base (4d995b2) to head (5ebf4ea).

Files with missing lines	Patch %	Lines
src/pytest_bdd/generation.py	54.54%	3 Missing and 2 partials ⚠️
src/pytest_bdd/gherkin_terminal_reporter.py	72.22%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #728      +/-   ##
==========================================
- Coverage   95.60%   95.38%   -0.22%     
==========================================
  Files          54       55       +1     
  Lines        2092     2188      +96     
  Branches      229      247      +18     
==========================================
+ Hits         2000     2087      +87     
- Misses         56       62       +6     
- Partials       36       39       +3     

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[jsa34]

@youtux Created a new PR with the rule feature in as I messed up the rebasing!

[jsa34]

Implemented all feedback.

Just this: #728 (comment) I think needs to be as it is, so we know what type of background it is (under a feature or under rule), but may have misunderstood the suggestion!

[Poogles]

Hero thanks for implementing this and the data tables work. <3

[jsa34]

Pleasure!

Glad it is hopefully helpful!