adding superfluid web3 plugin to the plugin list

[Salmandabbakuti]

Superfluid Web3 Plugin

The Superfluid Web3.js Plugin extends the capabilities of the Web3.js library to interact seamlessly with the Superfluid Protocol. This plugin provides convenient methods for interacting with the Superfluid protocol contracts.

• Repository: https://github.com/Salmandabbakuti/web3-plugin-superfluid
• NPM Package: https://www.npmjs.com/package/web3-plugin-superfluid

This PR is submitted as a part of Push Protocol BRB Bountie