added support for ripple

[ZeeshanJan]

All Submissions:

• Have you followed the guidelines in our Contributing documentation?
• Have you verified that there aren't any other open Pull Requests for the same update/change?
• Does the Pull Request pass all tests?

Description

Added support for the Ripple (XRP Ledger) in the tokenomics-decentralization framework.

Checklist

New Ledger Support Submissions:

• What mapping information did you add for the new ledger?
  • addresses
  • special addresses
• Did you add the new ledger to config.yaml?
• Did you document the added ledger in the documentation pages?

[LadyChristina]

@ZeeshanJan I think the only thing missing now is to update the documentation. Can you please update index.md and data.md in docs to include information about xrlp and how to fetch its data? After that I think we can merge the PR