Update README file with running the EVM Gateway on testnet

[m-Peter]

Description

---

For contributor use:

• [x] Targeted PR against master branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [x] Code follows the standards mentioned here.
• [x] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

Summary by CodeRabbit

• New Features

  • Enhanced configuration instructions for operating the EVM Gateway, especially for the testnet environment.
  • Introduced several new command-line options, including --gas-price for user experimentation.
  • Added a script for generating --coa-key and --coa-address, improving user security practices.

• Improvements

  • Updated existing command options with clear example values for better usability.
  • Expanded documentation on verifying the EVM Gateway's operation, including curl commands and expected responses.

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Commits

Files that changed from the base of the PR and between 039c83ccaac787127b5143890b0774dbfa05f785 and 8819b4937a5cfc9d166c0f22b59e215470d1bdbb.

Walkthrough

The changes enhance the configuration instructions for operating an EVM Gateway, particularly in the testnet environment. New command-line options have been introduced, existing options clarified, and instructions for key generation have been added. The documentation now includes details on verifying the EVM Gateway's operation, improving the overall usability of the setup process.

Changes

File	Change Summary
README.md	Enhanced configuration instructions for the EVM Gateway, including new command-line options and examples.
	Added instructions for generating --coa-key and --coa-address, including detailed output descriptions.
	Expanded verification section with specific curl command and expected JSON response.

Poem

🐰 In the meadow, hops a rabbit bright,
With new commands, oh what a sight!
Configs now clear, like stars in the night,
Setting up gateways, all feels just right!
With keys and endpoints, we dance with delight! 🌟

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