Add Rootstock network

Rootstock is an EVM compatible chain that leverages the security of Bitcoin with a smart contracts platform designed for a freer, fairer and more decentralized world. Website: https://rootstock.io/ Node setup: https://dev.rootstock.io/rsk/node/install/ Dev portal: https://rootstock.io/develop/ Integration with Dune would greatly benefit the protocol users, companies and stakeholders to get real time data insights, trend analysis on transaction volume, interactive dashboards / visualization for better decision making and strategy for the growth of the Rootstock ecosystem.