Matrix of Supported Language Features

[hughesjs]

Description (optional)

In the README (or another document) it would be good if we had a matrix/table/checklist of all of the features added with each language version (post 7) indicating whether it is supported out-of-the-box, supported with polysharp, not supported (yet), and not supported (and can't be supported).

Rationale

It would be a useful reference so people know exactly what features do and don't work. Yes, there's a list of the available polyfills but that doesn't actually tell us what features work when we add polysharp to our project, it tells us what extra features will work.

Proposed API

Documentation

[wallyrion]

+1 that would be really useful

[YoshiRulz]

This is more or less a duplicate of #47.

[wallyrion]

I'm currently working on this exact documentation for my own purpose. https://github.com/wallyrion/PolySharp.Playground
Keep in mind this is WIP and something may be changed. If anyone else finds it useful, please place the link to it in the readme.

[hughesjs]

@wallyrion - When the WIP is done, why don't you PR it into the main project readme? Looks great bud