Document airlift codestyle in contribution page

[Chaho12]

What do you guys think of documenting airlift codestyle in contribution page

@mosabua

[mosabua]

I think that would be good. We should essentially pull all the related info from https://github.com/trinodb/trino/blob/master/.github/DEVELOPMENT.md#code-style out into that page and then link to it ... it was on my todo list but fell off. If you send a PR I am happy to review

[Chaho12]

Sure, i'll add development section at contribution page