Update the Snaps README to include RPC documentation

[LindaOrtega]

… snaps repo

Add RPC documentation to Snaps README

Short description:
Restructure the README of the snaps library to provide more information on what RPC methods are available with MetaMask Snap and how to use them.

Besides some minor re-structuring and re-wording, this content was copied over from another repository and was originally created by @nillo.

Test scenarios

• Tested that the links worked correctly

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Latest commit: 156fc16

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[LindaOrtega]

I wasn't sure where to fine a more permanent documentation link for ICommandPayload.

I derived that the expected request type was this from the following areas of the code:

• kadena.js/packages/libs/snap/src/services/signTransaction.ts

  Line 53 in f883015

  txn = JSON.parse(transaction);

• kadena.js/packages/libs/snap/src/services/signTransaction.ts

  Line 75 in f883015

  const signerEntries = getSignerEntries(txn, publicKey);

• kadena.js/packages/libs/snap/src/services/signTransaction.ts

  Line 22 in f883015

  txnRequest: ICommandPayload,

But would appreciate it if someone else could verify as well.

[javadkh2]

as we discussed, IPactCommand is more current

[Randynamic]

@LindaOrtega can we update the linting and get this merged?