Problem

The Hedera JSON-RPC relay supports a Paymaster-style mode (introduced in v0.71) that allows operators to sponsor gas fees for selected users or contracts, enabling gasless transactions. However, this feature is currently undocumented in the main README, making it difficult for:

1. New users to discover and understand the gasless transaction capability
2. Operators to properly configure Paymaster settings for their use cases
3. Developers to implement gasless onboarding flows for better UX
4. Enterprise teams to leverage sponsored transactions for their applications

Without clear documentation, users may not be aware of this powerful feature or how to configure it safely and effectively.

Proposed Solution

Add comprehensive Paymaster documentation to the main README.md that explains the feature, configuration, and best practices.