Add examples to docs

[Andrey Sitnik]

People don’t like to read docs. They mostly look for some simple way to get information. This is why small example will be great. It should show what exactly clean-publish does and show benefits of using it.

[Danil Shashkov]

Added.

[Andrey Sitnik]

Great.

1. Put example to the top (since it is the fastest way to understand the problem)
2. Show some development config in package.json example (jest is a good example)

[Danil Shashkov]

👌

[Danil Shashkov]

Add jest example, add table of content, simple example in top.