Define language support levels

[jhoffner]

As the list of languages grow, we should officially define a tiered system of support for languages. Once formalized these languages should be documented so that its clear to all where things stand.

Tier 1 languages, such as JS, Python, Ruby are well supported by the core team and support things like frameworks, packages, multiple versions, multiple testing frameworks, project mode, etc.

2nd tier languages are those that are well supported but are missing some features, that we would like to add so that they can eventually become tier 1. These include Java and C#.

3rd tier languages are those languages that Qualified/Codewars supports as a baseline but are not likely to invest much of its own resources into maintaining.

4th tier languages are basically those that are supported solely through community contributions, with Codewars only supporting in terms of the most minimal effort needed to integrate into the site.