keyof , lookup types , mapped types , ReadonlyT and deep readonly

Some examples from here : https://github.com/basarat/conf-ndc-2017/tree/master/ts :rose:

Review the examples in https://github.com/basarat/conf-ndc-2017/tree/master/ts/ and compare them with the TypeScript book's treatment of keyof, lookup types, mapped types, ReadonlyT, and deep readonly. The issue names no target file, requested format, or acceptance criteria, so confirm the intended documentation location and what complete coverage should include before starting.

Written by the indexing model from the issue text.