Introductory section in the Docs

[navidcy]

I felt that the docs are missing a landing page or a section with a bit more of introductory material on what this package is about and a few example uses. The docs at their current form are mostly a long list of implemented methods but there is barely any explanation or examples of how these methods can be used. Usually docstrings are just a citation. That's great to get information about what's implemented but not as useful for how we can use that method within Julia and within the context of this package.

My 2 cents.