Added sequence diagram for github booster to the README

[dhalsim]

Starting with the Nostrize Booster feature for Github.
Added sequence diagram.

Will need a special relay for storing zap/boost events, possible in a different repo

In the Extension, we can write the code as if this relay exists.

There may be a need for a new setting such as, publish zap/boost events only to nostrize relay. otherwise all the relays would get the zap events but I don't think it is necessary

I need a lightning node too, but it is related to the relay code, not here

After getting the boost events from the relay, should transform it into Boost format:

    {
      type: "repo",
      from: "nostrize",
      to: "nbd-wtf/nostr-tools",
      created_at: agoInSeconds({ hours: 34 }),
      amountSats: 21000,
      message:
        "One of the coolest nostr software out there 😎 a must have for every client developer",
    }