Add instructions for snapshots in README.md

[d-szns]

Description

The current README mentions snapshots to speed up syncing of nodes. However there are no clear instructions on how to use the snapshot upon startup of the node.

Suggested Solution

Add a section on how to use the snapshots. There was a helpful thread on Discord that summarized the process. It would help new node operators to have a single source to reference when starting a node.

[wbnns]

@d-szns

Thanks for the feedback! We'll look into adding this. 👍

[MindlessSteel]

Yes publish the snapshot.
Set-up for those that don't use discord, not everyone uses that
Platform.