Access package documentation in REPL

[Tamas_Papp]

I saw this trick for including the REAMDE as a docstring in @tkf’s packages:

Plea to package developers regarding documentation!

I usually put a badge like this [GitHub commits since tagged version] in README with [](https://github.com/USER/PACKAGE.jl) and then use it as the docstring of the module by this one-linear @doc read(joinpath(dirname(@__DIR__), "README.md"), String) PACKAGE so that the badge is included in the documentation (e.g., https://tkf.github.io/BangBang.jl/dev/#BangBa…