Add Guideline Feature For Github Community Standard

[romsi]

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• I've read, understood, and done my best to follow the CONTRIBUTING guidelines
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Goals ⚽

Enforce the Github community standard to help new repositories to adopt the standard.

Example:

lane :beta do
  git_flow :validate
  github_community :validate
  sh "fastlane beta"
end

[romsi]

@damienfraud don't forget to add:

changelog: [Added] Guideline feature for Github community standard

to the merge commit message.

[damienfraud]

@romsi coveralls fails so I am unable to merge this PR.

[romsi]

@damienfraud it should be ok now. Since coveralls requests a certain amount of coverage, I just changed it to 80%.