Add testing style guides

[boan-anbo]

• Add lint rules to warn against should
• differentiate between subject and expected actions (story).
• Make them extensible by not repeating subjects when they are consistent.

describe(myStory.who, () => it(myStory.story, ()=> TEST))

• Let easy access to Who value, so people can use `describe(myStory.who, ()

References

• Jasmine Style Guide
• Gitlab style guide
• Better Specs
• Intellisoft on writing acceptance criteria