chore(tests/docs): CLI changes, updated README and tests added.

[martinhalford]

Changes

Updated Demo Template to make it easier for someone getting started with using the Accord Project for the first time.
Added test infrastructure the CLI tools and added some usage documentation to README.

Test Infrastructure (New)

• Added Jest testing framework with minimal configuration
• Created 3 test suites using CLI integration testing:
  • trigger.test.js - 17 tests for business logic CLI tool
  • draft.test.js - 23 tests for contract generation CLI tool
  • list-data-files.test.js - 8 tests for data file explorer tool
• Implemented process spawning strategy - tests actual command-line usage rather than mocking

Documentation Consolidation

• Updated README.md with some examples, and a usage guide

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname