Readme enhancements

[lanrebr]

url: https://github.com/essenciary/Genie.jl

Location: Working with resources/Adding views/Rendering views
Missing: explain that the html! method comes from the Renderer class
Example: Add "using Genie.Renderer" at the top of the definition of the billgatesbooks function

Location: Generate the Controller
Missing: explain that the user should test the BooksController.billgatesbooks function in Julia to make sure it produces the expected text to avoid issues later
Example: genie> BooksController.billgatesbooks()

[essenciary]

Sounds good, thanks, will add (or feel free to make the changes yourself and make a pull request, if you're so inclined).

[essenciary]

Done, thanks!