Document Cardano Stake Distribution

[jpraynaud]

Why

We need to update the documentation for the Cardano stake distribution and create an example crate for it.

What

Update the documentation website that of the clients for Cardano stake distribution and a create a new example crate in the repository.

How

• Create a new example crate in the repository
• Update the clients documentation pages:
  • Mithril client library
  • Mithril client node
  • Mithril client library WASM
• Update the Readme page for the npm package

Later

• Create a dev blog post